# ToolKK (工具匠) — Full Tool List

> Complete list of all 1141 free online tools at https://www.toolkk.com, grouped by category. Available in 简体中文 / 繁體中文 / English / 日本語. Auto-generated; see https://www.toolkk.com/llms.txt for the concise overview.

## Crypto (70)

> Online encryption, decryption, and encoding conversion, supporting multiple algorithms such as MD5, Base64, and AES.

- [Caesar Cipher Encoder & Decoder](https://www.toolkk.com/tools/caesar-cipher): Free online Caesar cipher encryption and decryption tool. Supports custom alphabets and shift offsets. Ideal for cryptog…
- [Random Number Generator](https://www.toolkk.com/tools/random-number-generator): Generate random integers or decimals within a specified range, featuring duplicate removal, sorting, and formatted outpu…
- [Random Password Generator](https://www.toolkk.com/tools/random-password-generator): Customize character types and length to generate strong random passwords and secure your accounts.
- [Vigenère Cipher Encoder & Decoder](https://www.toolkk.com/tools/vegenere-cipher): Encrypt or decrypt text using the classic polyalphabetic substitution algorithm. Ideal for cryptography learning and tes…
- [CRC16 Checksum Calculator](https://www.toolkk.com/tools/crc16-checksum): Online CRC16 checksum tool to calculate 16-bit cyclic redundancy check values for text, Hex, and Base64 data to verify d…
- [Morse Code Translator](https://www.toolkk.com/tools/morse-code): Translate text to Morse code and vice versa. Features custom dot/dash symbols and audio playback for learning and commun…
- [NTLM Hash Calculator](https://www.toolkk.com/tools/ntlm-hash): Calculate the NTLM hash of any string. Supports plaintext, Hex, and Base64 inputs, outputting results in Hex and Base64…
- [AES Encryption & Decryption Tool](https://www.toolkk.com/tools/aes-encrypt-decrypt): Online AES encryption and decryption tool supporting multiple cipher modes and key lengths to ensure data security.
- [CRC32 Checksum Calculator](https://www.toolkk.com/tools/crc32-checksum): Calculate the CRC32 hash of any string or encoded data to verify data integrity.
- [MD5 Hash Generator](https://www.toolkk.com/tools/md5-encrypt): Generate MD5 hash values for any data. Ideal for data integrity checks, file verification, and more.
- [File MD5 Changer](https://www.toolkk.com/tools/file-md5-modifier): Generate visually identical PNG/JPG images with a brand new MD5 hash to bypass duplicate detection or force cache update…
- [Base Converter](https://www.toolkk.com/tools/base-convert): Convert integers between binary, octal, decimal, and hexadecimal. Ideal for programming and mathematical calculations.
- [File Encoding Detector](https://www.toolkk.com/tools/file-encode-detect): Identify text file character encoding formats to fix garbled text. Supports multi-language content analysis.
- [ASCII Encoder & Decoder](https://www.toolkk.com/tools/ascii-encode-decode): Free online tool for two-way conversion between text and ASCII (decimal) codes. Ideal for programming, debugging, and da…
- [AAEncode Encoder & Decoder - Obfuscate & Deobfuscate JS Online](https://www.toolkk.com/tools/aaencode-encode-decode): Free online tool to encode JavaScript into the AAEncode obfuscated format or decode AAEncode strings back to readable JS…
- [CRC32 Checksum Calculator](https://www.toolkk.com/tools/file-crc32-checksum): Calculate file CRC32 checksums online to verify file integrity after transmission or storage. Ideal for both developers…
- [UUencode & UUdecode Tool](https://www.toolkk.com/tools/uu-encode-decode): Convert binary data to uuencoded text and vice versa online. Supports full format parsing, ideal for processing legacy e…
- [SHA Hash Calculator](https://www.toolkk.com/tools/sha-encrypt): Online hash generator and verification tool supporting SHA1, SHA256, and SHA512 algorithms, featuring advanced salting a…
- [LM Hash Calculator](https://www.toolkk.com/tools/lm-hash): Convert plaintext, Hex, or Base64 strings into LM hashes. Get instant Hex and Base64 outputs with uppercase and lowercas…
- [Base64 Encoder and Decoder](https://www.toolkk.com/tools/base64-encode-decode): Convert text to and from Base64 strings. Supports standard and URL-safe encoding, and is compatible with UTF-8 and multi…
- [Unicode Encoder & Decoder](https://www.toolkk.com/tools/unicode-encode-decode): A tool for bidirectional conversion between text and Unicode escape sequences (such as \uXXXX format).
- [HTML Entity Encoder & Decoder](https://www.toolkk.com/tools/html-encode-decode): Convert HTML special characters to and from entity codes for secure web rendering and code display.
- [JJEncode Encoder & Decoder | Online JS Obfuscator](https://www.toolkk.com/tools/jjencode-encode-decode): Free online JJEncode tool for JavaScript obfuscation and deobfuscation. Easily encode JS for code protection or decode s…
- [Base32 Encoder and Decoder](https://www.toolkk.com/tools/base32-encode-decode): Base32 encoder and decoder tool for converting binary data into readable alphanumeric strings. Ideal for DNSSEC, file na…
- [Base58 Encoder & Decoder](https://www.toolkk.com/tools/base58-encode-decode): Easily convert text to Base58 and vice versa. Ideal for blockchain address processing and data verification.
- [URL Encoder & Decoder](https://www.toolkk.com/tools/url-encode-decode): Convert special characters and spaces into percent-encoded URLs and vice versa to solve character compatibility issues i…
- [SHAKE Hash Generator](https://www.toolkk.com/tools/shake-encrypt): Variable-length hash generator for SHAKE-128/256, featuring salt support, multiple iterations, and various input/output…
- [Serpent Encryption & Decryption Tool](https://www.toolkk.com/tools/serpent-encrypt-decrypt): A text encryption and decryption tool based on the Serpent algorithm, supporting multiple key lengths and operation mode…
- [UUID Generator](https://www.toolkk.com/tools/uuid-guid-generator): Bulk generate unique identifiers (UUID/GUID) across multiple versions (V1-V7) for developers and system design.
- [BLAKE Hash Calculator](https://www.toolkk.com/tools/blake-encrypt): A hash generator supporting BLAKE2b and BLAKE2s algorithms with configurable keys, salts, and output lengths for data in…
- [Index of Coincidence Calculator](https://www.toolkk.com/tools/index-of-coincidence-calculator): Calculate the Index of Coincidence (IC) for cryptanalysis and language identification with English letter frequency stat…
- [FNV Hash Calculator](https://www.toolkk.com/tools/fnv-encrypt): Calculate FNV hashes online for any string. Supports FNV1, FNV1a, and various input formats for data validation and hash…
- [Chinese to UTF-8 Encoder & Decoder](https://www.toolkk.com/tools/chinese-utf8-converter): Convert between Chinese characters and UTF-8 encoding online. Supports fast conversion between plain text strings and pe…
- [Bulk SHA Hash Generator](https://www.toolkk.com/tools/sha-encrypt-batch): Bulk generate SHA-1, SHA-256, and SHA-512 hashes. Supports HEX/Base64 formats and case conversion for data validation an…
- [Keccak Hash Calculator](https://www.toolkk.com/tools/keccak-encrypt): Online hash tool supporting Keccak-224, 256, 384, and 512 algorithms. Features custom salt, iterations, and multiple inp…
- [UTF-8 Encoder & Decoder](https://www.toolkk.com/tools/utf8-encode-decode): A versatile UTF-8 encoder and decoder supporting Escape, percent, hex, Unicode escape, and BOM modes. Perfect for develo…
- [Bulk MD5 Hash Generator](https://www.toolkk.com/tools/md5-batch-encrypt): Free bulk MD5 hash calculator supporting multi-line text and file uploads. Outputs HEX/Base64 formats with CSV export.
- [MD6 Hash Generator](https://www.toolkk.com/tools/md6-encrypt): Generate 128, 256, or 512-bit MD6 hashes online. Supports custom keys and iteration levels for data validation and secur…
- [RC4 Encryption & Decryption Tool](https://www.toolkk.com/tools/rc4-encrypt-decrypt): Perform RC4 stream cipher encryption and decryption online. Supports direct text input and secret key management.
- [URL Hex Encoder & Decoder](https://www.toolkk.com/tools/url-hexadecimal-encode): Convert between URL strings and hex-encoded formats online to easily solve special character transmission issues.
- [TIGER Hash Calculator](https://www.toolkk.com/tools/tiger-encrypt): Calculate TIGER-128, TIGER-160, and TIGER-192 hashes online. Supports multiple input formats and salting for data valida…
- [Whirlpool Hash Generator](https://www.toolkk.com/tools/whirlpool-encrypt): Generate Whirlpool hash values online for data integrity checks and signature verification.
- [File SHA Checksum](https://www.toolkk.com/tools/file-sha-checksum): Calculate file SHA hash values, verify integrity and security, support SHA-1/256/512 algorithms
- [Online DES Encryption & Decryption Tool](https://www.toolkk.com/tools/des-encrypt-decrypt): Perform DES encryption and decryption online. Supports Text, Hex, and Base64 formats.
- [Punycode Encoder & Decoder](https://www.toolkk.com/tools/punycode-encode-decode): An online converter for Internationalized Domain Names (IDNs) and ASCII formats, designed to process non-ASCII character…
- [File MD5 Checksum](https://www.toolkk.com/tools/file-md5-checksum): Calculate file MD5 hashes online to verify file integrity and prevent data corruption or tampering during downloads and…
- [PHP Password Hash Generator](https://www.toolkk.com/tools/php-password-hash): Generate PHP password_hash values online. Supports BCrypt, Argon2I, and Argon2ID algorithms for secure password storage.
- [Rabbit Stream Cipher Encrypt & Decrypt Tool](https://www.toolkk.com/tools/rabbit-encrypt-decrypt): Free online Rabbit stream cipher tool for fast text encryption and decryption. Supports 128-bit keys and 64-bit IVs to q…
- [RIPEMD Hash Generator](https://www.toolkk.com/tools/ripemd-encrypt): Generate RIPEMD-128, RIPEMD-160, RIPEMD-256, and RIPEMD-320 hashes online. Supports text, Hex, and Base64 inputs.
- [Escape Encoder & Decoder](https://www.toolkk.com/tools/escape-encode-decode): Free online tool for Escape encoding and decoding strings, making URL parameter passing and data processing easier.
- [MD2 Hash Generator](https://www.toolkk.com/tools/md2-encrypt): Generate MD2 hashes online with support for multiple input formats, salting, and iteration settings for data integrity v…
- [JOAAT Hash Generator](https://www.toolkk.com/tools/joaat-encrypt): Quickly generate JOAAT hash values for text, ideal for data validation and resource identification.
- [Blowfish Encryption & Decryption Tool](https://www.toolkk.com/tools/blowfish-encrypt-decrypt): Encrypt or decrypt data online using the Blowfish symmetric algorithm to ensure privacy and security. Supports multiple…
- [MD4 Hash Generator](https://www.toolkk.com/tools/md4-encrypt): Generate MD4 message digests online with support for multiple input formats, salt, iterations, and encoding options.
- [HAVAL Hash Generator](https://www.toolkk.com/tools/haval-encrypt): Generate HAVAL hashes online. Supports multiple output lengths and computational passes for data integrity verification.
- [GOST Hash Calculator](https://www.toolkk.com/tools/gost-encrypt): Calculate GOST hashes online. Supports GOST and GOST-CRYPTO algorithms, custom salting, multiple iterations, and various…
- [HMAC-SHA Calculator](https://www.toolkk.com/tools/hmac-sha-encrypt): Securely calculate message authentication codes (MAC). Supports SHA256, SHA512, and other algorithms to verify data inte…
- [Text Frequency Analyzer](https://www.toolkk.com/tools/frequency-analysis): Count the frequency of characters or phrases in your text. Supports custom N-gram lengths and character types.
- [Adler32 Checksum Calculator](https://www.toolkk.com/tools/adler32-checksum): Generate Adler32 checksums for strings. Supports Text, Hex, and Base64 inputs for fast data integrity verification.
- [Kasiski Examination Tool](https://www.toolkk.com/tools/kasiski-test): Estimate the key length of classical ciphers like the Vigenère cipher by analyzing repeated ciphertext sequences to assi…
- [TripleDES Encrypt & Decrypt](https://www.toolkk.com/tools/tripledes-encrypt-decrypt): Provides TripleDES encryption and decryption features, supporting common modes like CBC/ECB and PKCS padding to protect…
- [Native to ASCII Converter](https://www.toolkk.com/tools/native-utf8-converter): Convert between native system encodings (like GBK, Big5) and ASCII representations to resolve garbled text and transmiss…
- [.htpasswd Generator](https://www.toolkk.com/tools/htpasswd-file-generator): Generate user authentication password files for Apache and other servers. Supports multiple encryption algorithms includ…
- [CAST Algorithm Encryption and Decryption](https://www.toolkk.com/tools/cast-encrypt-decrypt): A symmetric encryption and decryption tool based on the CAST-128 algorithm. Supports text and Base64 encoding conversion…
- [Snefru Hash Calculator](https://www.toolkk.com/tools/snefru-encrypt): Generate Snefru hashes online for data integrity checks and tamper verification.
- [UTF-8 BOM Checker](https://www.toolkk.com/tools/utf8-file-bom-checker): Detect and remove BOM signatures from UTF-8 files in one click. Fix parsing errors in PHP and optimize file compatibilit…
- [CJK to Unicode Converter](https://www.toolkk.com/tools/cjk-unicode): A bidirectional converter for CJK characters and Unicode code points. Supports multiple input formats to solve encoding…
- [Bulk MD5 File Checker](https://www.toolkk.com/tools/file-md5-batch-checksum): Bulk calculate MD5 hash values for files to verify integrity and consistency. Supports simultaneous multi-file processin…
- [Bulk File MD5 Changer](https://www.toolkk.com/tools/file-md5-batch-modifier): Efficiently change file MD5 hashes in bulk to generate brand new hash codes, solving issues like duplicate file checks a…
- [Batch File Encoding Checker](https://www.toolkk.com/tools/file-encoding-batch-detector): Batch detect text file encoding formats to fix garbled text. Supports common types like UTF-8 and GBK.

## Life (136)

> One-stop query for vehicle information, identity attribution, mobile phone numbers, enterprise business registration, your convenient life assistant.

- [Simplified & Traditional Chinese Converter](https://www.toolkk.com/tools/simplified-traditional-translation): Accurately convert between Simplified Chinese, Standard Traditional, Taiwanese Traditional, and Hong Kong Traditional Ch…
- [Chinese to Pinyin Converter](https://www.toolkk.com/tools/pinyin-chinese-converter): Convert Chinese characters (Hanzi) to Pinyin with tone marks or numbers. Features smart polyphone recognition and a dedi…
- [Random Chinese Name Generator](https://www.toolkk.com/tools/random-chinese-name-generator): Bulk generate random Chinese names by gender, length, and surname for novels, games, and character design.
- [Noise Detector](https://www.toolkk.com/tools/noise-detection): Measure environmental noise decibel levels in real-time using your device's microphone. Evaluate noise levels at home, i…
- [Fuel Consumption Calculator](https://www.toolkk.com/tools/fuel-consumption): Calculate key data like fuel consumption per 100km (L/100km) and cost per kilometer based on your driving distance, fuel…
- [Random Email Batch Generator](https://www.toolkk.com/tools/random-email-batch-generator): Generate correctly formatted random email addresses in bulk, with customizable domains and prefix rules — ideal for test…
- [Bra Size Calculator](https://www.toolkk.com/tools/bra-bust-calculator): Accurately calculate your cup and bra size using your bust and underbust measurements to find the perfect fitting bra.
- [Random Phone Number Generator (China & International)](https://www.toolkk.com/tools/random-phone-number-batch-generator): Free online random phone number generator. Batch generate up to 100 virtual phone numbers with custom prefixes for US an…
- [Text Case Converter](https://www.toolkk.com/tools/alphabet-case-converter): Online text case converter supporting multiple modes including uppercase, lowercase, and title case.
- [Chinese ID Number Extractor](https://www.toolkk.com/tools/idcard-extractor): Quickly locate and extract mainland China ID numbers from any text. Supports both 15-digit and 18-digit formats and incl…
- [Vehicle Inspection Date Calculator](https://www.toolkk.com/tools/car-mot-calculator): Automatically calculate your vehicle inspection schedule and next due date based on vehicle type and initial registratio…
- [English Name Generator](https://www.toolkk.com/tools/random-english-name-generator): Generate random English names for characters, accounts, or pets. Features gender filtering and quantity control.
- [Chinese Dynasty Timeline & Historical Eras Chart](https://www.toolkk.com/tools/historical-dynasties-ce-calendar): Quickly look up the years, historical capitals, and modern locations of Chinese dynasties.
- [Bulk Random User Agent Generator](https://www.toolkk.com/tools/random-useragent-batch-generator): Bulk generate browser and device User-Agent strings to simulate real user environments and effectively bypass anti-scrap…
- [Shipping Address Parser](https://www.toolkk.com/tools/shipping-address-parser): Smartly extract structured information like province, city, district, street, name, phone number, and ID from raw text f…
- [Hengshui Style English Handwriting Worksheet Generator](https://www.toolkk.com/tools/english-hengshui-copybook-generator): Easily generate custom Hengshui style English handwriting practice sheets online. Supports letter tracing and multiple e…
- [Bulk Two-Factor ID Card Verification](https://www.toolkk.com/tools/idcard-two-factor-batch-query): Bulk verify name and ID number matches while parsing gender, date of birth, and registered address. Ideal for enterprise…
- [License Plate Abbreviation Lookup](https://www.toolkk.com/tools/chinese-plate-shortname-query): Look up the license-plate abbreviation for every province and city in China, plus the specific region each trailing lett…
- [Xingkai Calligraphy Copybook Generator](https://www.toolkk.com/tools/semi-cursive-copybook-generator): Generate printable Xingkai pen calligraphy copybooks online. Features 3,500 common Chinese characters to boost your hand…
- [Phone Number Extractor](https://www.toolkk.com/tools/phone-extractor): Quickly extract phone numbers from text. Supports multiple formats and automatically filters invalid digits.
- [Chinese ID Card Verification](https://www.toolkk.com/tools/idcard-two-factor-verify): Verify if a Chinese ID card name and number match. Perfect for real-name authentication.
- [Phone, Name & ID Verification](https://www.toolkk.com/tools/mobile-three-verify): Verify the consistency of ID numbers, names, and phone numbers to prevent identity fraud. Ideal for real-name authentica…
- [Headphone Test](https://www.toolkk.com/tools/headphone-tester): Quickly test headphone connection and left/right audio channels to troubleshoot device issues. Supports both wired and B…
- [Japanese Name Generator](https://www.toolkk.com/tools/random-japanese-name-generator): Generate authentic Japanese names instantly. Features gender filters and custom quantities, perfect for writers and char…
- [Traffic Ticket Lookup](https://www.toolkk.com/tools/chinese-traffic-violation-query): Enter your license plate and VIN to check nationwide traffic violation records, including fine amounts and point deducti…
- [English Handwriting Worksheet Generator](https://www.toolkk.com/tools/english-word-copybook-generator): Generate printable English vocabulary handwriting worksheets with customizable content and formatting.
- [Random MAC Address Generator](https://www.toolkk.com/tools/random-mac-batch-generator): Efficiently generate random MAC addresses with custom OUI prefixes and multiple output formats. Ideal for network testin…
- [Package Tracking](https://www.toolkk.com/tools/express-number-query): Track major courier packages in real-time using your tracking number and phone number. Get transit history, delivery pro…
- [Alphabet Tracing Worksheet Generator](https://www.toolkk.com/tools/english-letter-copybook-generator): Generate printable 26-letter alphabet tracing worksheets online to help kids and beginners practice proper handwriting.
- [Image Angle Measurement Tool](https://www.toolkk.com/tools/protractor): Accurately measure angles on images and screens. Ideal for design, drafting, and geometry. Instantly displays the angle…
- [File Type Checker](https://www.toolkk.com/tools/file-type-detect): Detect the true file type (MIME type) and view file name and size details. Perfect for both developers and everyday user…
- [Name Tracing Worksheet Generator](https://www.toolkk.com/tools/name-tracing-copybook-generator): Enter your child's name to instantly generate a custom Chinese character tracing worksheet with Pinyin, stroke order, an…
- [Email Address Extractor](https://www.toolkk.com/tools/email-extractor): Automatically identify and extract all valid email addresses from any text, with optional result counting.
- [Business Entity 4-Factor Verification](https://www.toolkk.com/tools/enterprise-four-factor-verify): Verify the consistency of a company name, Unified Social Credit Code, legal representative name, and ID number with offi…
- [Daily Chinese Handwriting Worksheet Generator](https://www.toolkk.com/tools/daily-copybook-generator): Free generator for 1st to 6th grade daily Chinese handwriting worksheets. Supports custom content with instant PDF downl…
- [汉字笔顺字帖生成器](https://www.toolkk.com/tools/stroke-order-copybook-generator): 输入汉字即可生成标准笔画顺序与描红练习格，支持调节字号与练习格数，一键导出PNG或PDF，适合临摹教学。
- [Bulk Phone Number Validator](https://www.toolkk.com/tools/mobile-empty-batch-check): Bulk check phone number statuses to identify active, unassigned, disconnected, high-risk, and inactive numbers. Improve…
- [City Barometric Pressure Lookup](https://www.toolkk.com/tools/city-pressure-query): Accurately get real-time sea-level barometric pressure for major Chinese cities, with data sourced from the National Met…
- [Company Name & USCC Verification](https://www.toolkk.com/tools/enterprise-two-factor-verify): Verify if a company name matches its Unified Social Credit Code (USCC) for qualification audits and risk management.
- [Business Entity 3-Factor Verification](https://www.toolkk.com/tools/enterprise-three-factor-verify): Instantly verify if a company name, business registration code, and legal representative match to ensure authentic and r…
- [City Humidity Checker](https://www.toolkk.com/tools/city-humidity-query): Get real-time relative humidity data for prefecture-level cities in China for health protection and environmental monito…
- [Pinyin Worksheet Generator](https://www.toolkk.com/tools/pinyin-copybook-generator): Generate printable Pinyin practice worksheets for initials and finals to improve handwriting and stroke order.
- [Random Korean Name Generator](https://www.toolkk.com/tools/random-korean-name-generator): Generate authentic Korean male and female names. Supports custom surnames and quantities, perfect for creative writing,…
- [2026 Official Public Holiday Schedule](https://www.toolkk.com/tools/2026-holiday-notice): Check the official 2026 public holiday dates and make-up work day schedules to easily plan your itinerary in advance.
- [Running Script Copybook Generator](https://www.toolkk.com/tools/running-script-copybook-generator): Generate printable Chinese running script copybooks featuring 3,500 common characters to enhance your hard pen calligrap…
- [Childcare Subsidy Calculator](https://www.toolkk.com/tools/child-benefit-calculator): Calculate the eligible duration and total amount of childcare subsidies based on your child's date of birth.
- [Phone Number & Name Verification](https://www.toolkk.com/tools/mobile-two-verify): Verify whether a phone number matches a name or ID to ensure the authenticity of real-name information.
- [Coordinate Converter](https://www.toolkk.com/tools/coordinate-location-converter): Achieve high-precision conversions between lat/long, addresses, and WGS84/GCJ02/BD09 coordinate systems to fix map locat…
- [看拼音写词语生成器](https://www.toolkk.com/tools/pinyin-word-practice-generator): 专为小学一二年级设计的拼音识字练习页生成工具，支持预设词库与自定义输入，可一键导出高清打印版。
- [Tire Size Calculator](https://www.toolkk.com/tools/tire-calculator): Calculate speedometer error and ride height changes after upgrading your tires.
- [Number Tracing Worksheet Generator](https://www.toolkk.com/tools/number-copybook-generator): Generate free 1-10 number tracing worksheets to help kids master early writing skills.
- [Phone Number Status Checker](https://www.toolkk.com/tools/mobile-online-status-query): Check mobile phone number carrier, active status, and porting information.
- [City UV Index Checker](https://www.toolkk.com/tools/city-uv-index-query): Check real-time UV index and sun protection advice for cities nationwide.
- [Random German Name Generator](https://www.toolkk.com/tools/random-german-name-generator): Generate authentic German names with custom gender and type settings. Perfect for character naming, language learning, a…
- [English Italic Handwriting Worksheet Generator](https://www.toolkk.com/tools/english-italic-copybook-generator): Create custom English italic handwriting worksheets online. Instantly generate printable Italianno tracing copybooks for…
- [Bulk Password Generator](https://www.toolkk.com/tools/random-password-batch-generator): Bulk generate strong, random passwords with custom rules. Perfect for secure multi-account management.
- [French Name Generator](https://www.toolkk.com/tools/random-french-name-generator): Generate authentic French names for character creation, gaming IDs, and cultural learning.
- [Keyboard APM Test](https://www.toolkk.com/tools/keyboard-apm-test): Measure your effective keystrokes per minute to evaluate typing speed and accuracy. Ideal for programmers and writers.
- [Online GPU Tester](https://www.toolkk.com/tools/gpu-tester): Test GPU performance and stability with real-time temperature monitoring and benchmark reports. Perfect for gamers and P…
- [Moon Phase Calculator](https://www.toolkk.com/tools/moon-phase-query): Accurately calculate the moon phase, lunar calendar, and solar terms for any date.
- [古诗词字帖生成器](https://www.toolkk.com/tools/poem-copybook-generator): 内置经典诗词库与自定义输入，支持调节田字格尺寸与排版，一键导出高清图片与PDF练字帖。
- [Random Italian Name Generator](https://www.toolkk.com/tools/random-italian-name-generator): Generate authentic Italian name combinations, perfect for character naming, creative writing, and cultural research.
- [Phone Number Status Checker](https://www.toolkk.com/tools/mobile-empty-check): Verify phone number status, location, and carrier to clean invalid data and boost marketing efficiency.
- [Geographic Coordinate Converter](https://www.toolkk.com/tools/location-coordinate-converter): The geographic coordinate converter supports accurate conversion between WGS84, GCJ02, and BD09 coordinate systems to fi…
- [Bulk Phone Number and Name Verification](https://www.toolkk.com/tools/mobile-two-factor-batch-verify): Bulk verify phone number and name matches. Ideal for financial risk control, user registration, and identity verificatio…
- [Chinese Character Tracing Worksheet Generator](https://www.toolkk.com/tools/kid-hanzi-tracing-copybook): Instantly generate custom Chinese character tracing worksheets for kids aged 3-6. Features stroke order breakdowns and T…
- [Bulk Random IP Generator](https://www.toolkk.com/tools/random-ip-batch-generator): Bulk generate random IPv4/IPv6 addresses with support for custom subnets and CIDR formats. Ideal for network testing and…
- [Bulk Mobile 3-Element Verification](https://www.toolkk.com/tools/mobile-three-batch-verify): Batch verify the consistency of ID, name, and phone numbers to prevent fraud and fake information.
- [生字描红组词字帖生成](https://www.toolkk.com/tools/word-phrase-copybook-generator): 面向小学一二年级语文学习。内置生字词库，支持自定义输入，一键生成描红与组词练习纸，支持导出图片与PDF。
- [Random Spanish Name Generator](https://www.toolkk.com/tools/random-spanish-name-generator): Generate authentic Spanish names with custom surnames and batch quantities. Perfect for creative writing and language le…
- [Phone Number Age Checker](https://www.toolkk.com/tools/mobile-online-time-query): Check how long a phone number has been active on a carrier network to assess its stability and activity level.
- [控笔训练字帖生成器](https://www.toolkk.com/tools/pen-control-practice-generator): 专为幼儿与学前儿童设计的描红练习工具，支持自定义笔画类型、网格尺寸与颜色，一键导出PNG或PDF格式供打印。
- [Pace Calculator](https://www.toolkk.com/tools/pace-calculator): Accurately calculate your average running pace and split times based on your distance and time.
- [TV Size and Viewing Distance Calculator](https://www.toolkk.com/tools/tv-size-distance-calculator): Quickly calculate the recommended TV size range based on your viewing distance and resolution.
- [Microphone Tester](https://www.toolkk.com/tools/microphone-tester): Check your microphone status online with real-time volume waveforms. Supports device switching and test sound playback t…
- [Crushed Stone Calculator](https://www.toolkk.com/tools/crushed-stone-volume-calculator): Enter dimensions and density to automatically calculate the volume and weight of crushed stone for roadbeds, foundations…
- [Online MIDI Tester](https://www.toolkk.com/tools/midi-tester): Play, parse, and debug MIDI files or hex data online. Features event log analysis and instant music playback to assist i…
- [Batch Geocoding (Address to Coordinates)](https://www.toolkk.com/tools/location-coordinate-batch-converter): Convert batch addresses to latitude/longitude coordinates; supports text paste and Excel upload/export; up to 500 entrie…
- [Estimated Retirement Age Calculator](https://www.toolkk.com/tools/retirement-calculator): Quickly calculate your estimated retirement age and remaining working years based on your birth year and gender.
- [City Wind Speed & Direction Checker](https://www.toolkk.com/tools/city-wind-query): Get real-time wind speed and direction data for Chinese cities, featuring unit toggling and azimuth angle display.
- [University Search](https://www.toolkk.com/tools/university-search-tool): Enter a university name to quickly access official information including degree levels, location, and governing bodies.
- [City Weather Forecast](https://www.toolkk.com/tools/city-weather-query): Check real-time weather and future forecasts for cities worldwide, including key metrics like temperature and humidity.
- [TV Size Calculator](https://www.toolkk.com/tools/tv-size-calculator): Input TV diagonal inches, instantly calculate screen width, height, area and recommended viewing distance.
- [Wind Chill Calculator](https://www.toolkk.com/tools/wind-chill-calculator): Calculate the feels-like wind chill index based on air temperature and wind speed, assess frostbite risks, and get safet…
- [Mobile Number Porting Checker](https://www.toolkk.com/tools/mobile-transfer-query): Look up the location, original and current carrier, porting status, and virtual operator (MVNO) identification for mainl…
- [TV Mount Height Calculator](https://www.toolkk.com/tools/tv-mount-height-calculator): Calculate the recommended TV installation height based on screen size, viewing distance, and seated eye level for comfor…
- [Noise Meter Pro](https://www.toolkk.com/tools/noise-detection-pro): Professional Noise Detector: A/C/Z Weighting, Spectrum Analysis, Data Export
- [Headphone Tester Pro](https://www.toolkk.com/tools/headphone-tester-pro): Test headphones with microphone loop: frequency response sweep curves, channel balance & phase, THD distortion measureme…
- [City Weather Comparison](https://www.toolkk.com/tools/city-weather-compare): A real-time multi-city weather comparison tool providing key metrics like temperature, humidity, wind speed, and air qua…
- [ID Photo Size Lookup](https://www.toolkk.com/tools/id-photo-size-query): Lookup standard dimensions for common ID and passport photos, including pixels, millimeters, and usage requirements, to…
- [Courier Location Finder](https://www.toolkk.com/tools/express-outlet-query): Accurately find addresses and phone numbers for couriers like SF Express and ZTO for fast package drop-offs and pickups.
- [Classical Chinese Copybook Generator](https://www.toolkk.com/tools/classical-chinese-copybook-generator): Instantly format classic Chinese texts to generate printable handwriting practice templates with multiple grid styles an…
- [Room Measurement Calculator](https://www.toolkk.com/tools/room-measurement-calculator): Input room dimensions and doors/windows room by room, automatically calculate area and estimate tile, paint, and other m…
- [Bank Card Name Match Verification](https://www.toolkk.com/tools/bankcard-two-factor-verify): An online tool to verify if a bank card matches the cardholder's name. Ideal for payment security, identity verification…
- [Webcam Tester](https://www.toolkk.com/tools/webcam-tester): Test your webcam's functionality, video quality, and performance. Supports multiple devices and real-time filter effects…
- [Yearly Progress Bar Generator](https://www.toolkk.com/tools/annual-progress): Generate a yearly budget and goal progress bar to visually track your completion status.
- [Bulk Phone Number Location Lookup](https://www.toolkk.com/tools/phone-number-location-batch-query): Efficiently look up the location, carrier, and network type of mainland China mobile numbers. Supports bulk processing a…
- [Turtle Age Calculator](https://www.toolkk.com/tools/turtle-age-calculator): Estimate your turtle's age based on shell length and species to make informed care and feeding decisions.
- [Bulk Shipping Address Parser](https://www.toolkk.com/tools/batch-shipping-address-parser): Smartly bulk parse unstructured addresses to extract names, phone numbers, states, cities, and detailed addresses, boost…
- [Horse Age Calculator](https://www.toolkk.com/tools/horse-age-calculator): Accurately convert horse years to human years to help owners understand their horse's growth stage.
- [Online Screen Ruler](https://www.toolkk.com/tools/ruler): Measure the length and distance of objects on your screen online. Supports multiple units including pixels, millimeters,…
- [VIN Decoder](https://www.toolkk.com/tools/car-vin-query): Enter a 17-digit VIN to decode over 40 vehicle specs, including make, model, and year. Perfect for used car inspections…
- [Rabbit Age Calculator](https://www.toolkk.com/tools/rabbit-age-calculator): Accurately convert your rabbit's age into human years to better understand your pet's life stage.
- [City Precipitation Forecast](https://www.toolkk.com/tools/city-precipitation-query): Accurately check the 24-hour hourly precipitation data for prefecture-level and above cities in China.
- [Hamster Age Calculator](https://www.toolkk.com/tools/hamster-age-calculator): Accurately convert your hamster's age to human years and better understand your pet's life stages.
- [Kids' Shoe Size Conversion Chart](https://www.toolkk.com/tools/children-shoe-size-reference): Free online kids' shoe size conversion chart. Quickly match US, UK, EU, and CN children's shoe sizes by entering foot le…
- [Kids' Clothing Size Chart](https://www.toolkk.com/tools/children-clothing-size-reference): Provides a quick online comparison and conversion tool for international kids' clothing sizes, including US, UK, EU, Chi…
- [Dishonest Debtor Lookup](https://www.toolkk.com/tools/dishonesty-query): Quickly look up dishonest judgment debtor information and deadbeat list details to help you avoid risks and understand c…
- [Mobile Number Location Lookup](https://www.toolkk.com/tools/phone-number-location-query): Quickly check the registered location, original carrier, and virtual network operator status of any Chinese mobile numbe…
- [Recipe Finder](https://www.toolkk.com/tools/recipe-query): Enter ingredients or dish names to quickly find matching recipes, step-by-step instructions, and ingredient lists.
- [Business Entity Keyword Search](https://www.toolkk.com/tools/enterprise-fuzzy-query): Search business registration information by keyword to find company names, registration codes, legal representatives, an…
- [World Capital Lookup](https://www.toolkk.com/tools/word-capital-query): Quickly look up the capital cities of countries worldwide. Supports bulk searching.
- [Recycled Phone Number Checker](https://www.toolkk.com/tools/mobile-reissue-query): Check if a phone number has been recycled by the carrier, identify the carrier, and avoid spam calls and registration pr…
- [Mulch Calculator](https://www.toolkk.com/tools/coverage-calculator): Accurately calculate the volume and weight of mulch needed for landscaping and paving to avoid material waste and optimi…
- [Company Invoicing Information Lookup](https://www.toolkk.com/tools/enterprise-invoice-query): Enter the full company name to instantly retrieve tax IDs, addresses, and bank details for more efficient financial reco…
- [ID Card Location Lookup](https://www.toolkk.com/tools/id-card-location-query): Parse the first 6 digits of a Chinese ID card to find the registered location, instantly retrieving province, city, and…
- [Company Business Registration Lookup](https://www.toolkk.com/tools/enterprise-info-query): Look up authoritative business registration information using a company name or Unified Social Credit Code. Ideal for ba…
- [Bird Age Calculator](https://www.toolkk.com/tools/bird-age-calculator): Accurately calculate your pet bird's age and life stage for better care and management.
- [Vehicle 5-Item Information Lookup](https://www.toolkk.com/tools/car-five-info-query): Lookup core vehicle records by license plate or VIN, including license plate number, VIN, engine number, registration da…
- [Tourist Attraction Lookup](https://www.toolkk.com/tools/scenic-spot-query): Enter an attraction name to instantly get opening hours, ticket prices, ratings, and travel guides.
- [Business Tax ID & Taxpayer Information Lookup](https://www.toolkk.com/tools/enterprise-taxpayer-query): Enter a company name to instantly get tax information, including the Taxpayer Identification Number and qualification ty…
- [Company Litigation Search](https://www.toolkk.com/tools/enterprise-litigation-query): Enter a company name to search for litigation cases and get details like case numbers and judgment dates to assist with…
- [Bulk Phone Number Age Lookup Tool](https://www.toolkk.com/tools/mobile-online-time-batch-query): Bulk check the age of Chinese phone numbers for user profiling and risk assessment.
- [Produce Price Lookup](https://www.toolkk.com/tools/agricultural-product-price): Check real-time wholesale produce prices across major agricultural markets in China. Compare daily prices to make smart…
- [Bulk Mobile Number Portability Checker](https://www.toolkk.com/tools/mobile-transfer-batch-query): Bulk check mobile number portability (MNP) status and current carriers. Ideal for enterprise data cleansing and SMS mark…
- [Flight Information Lookup](https://www.toolkk.com/tools/flight-info-query): Check flight schedules, real-time updates, delays, and cancellation information to help you plan your departure and airp…
- [Subordinate Administrative Region Lookup](https://www.toolkk.com/tools/administrative-subdivision-query): Accurately look up subordinate administrative units using a parent region ID to get key data like names, levels, and coo…
- [China Administrative Divisions Lookup](https://www.toolkk.com/tools/administrative-division-query): Accurately search China's 5-level administrative regions (province, city, district, county, township) to get coordinates…
- [Nationwide Gas Price Checker](https://www.toolkk.com/tools/national-fuel-price-query): Check real-time price data for 92#, 95#, and 98# gasoline, as well as 0# diesel across all provinces and cities.
- [Car Brand Lookup](https://www.toolkk.com/tools/vehicle-brands-directory): Provides global car brand information lookup, including Chinese name, English name, origin, and luxury classification.
- [Bulk Expiration Date Calculator](https://www.toolkk.com/tools/batch-shelf-life-calculator): Bulk calculate product expiration dates in days, months, or years. Perfect for inventory management and expiry tracking.
- [Online Keyboard Tester](https://www.toolkk.com/tools/keyboard-tester): Test your keyboard for broken keys and ghosting issues. A free hardware diagnostic tool to check key functionality and r…
- [Bulk Business Verification](https://www.toolkk.com/tools/enterprise-three-factor-batch-verify): Bulk verify business entity authenticity and data consistency using company names, unified social credit codes, and lega…
- [Bulk Business Entity Two-Factor Verification](https://www.toolkk.com/tools/enterprise-two-factor-batch-verify): Bulk verify the match between company names and Unified Social Credit Codes to ensure your business partners are authent…
- [Bulk Business Identity Verification (4-Factor)](https://www.toolkk.com/tools/enterprise-four-factor-batch-verify): Bulk verify business authenticity using company name, registration number, legal representative name, and ID number. Ide…
- [Batch Coordinate to Address Converter](https://www.toolkk.com/tools/coordinate-location-batch-converter): Batch reverse geocode latitude and longitude coordinates into detailed addresses. Supports Excel upload and export, proc…

## Datetime (159)

> Provides timestamp conversion, time zone query, date calculation, lunar calendar conversion, and online countdown.

- [Expiration Date Calculator](https://www.toolkk.com/tools/shelf-life-calculator): Calculate the expiration date based on the production date and shelf life, or check the near-expiry and expired status b…
- [Age Calculator (Western, Chinese & Lunar)](https://www.toolkk.com/tools/age-calculator): Enter your birth date to instantly calculate your exact age, traditional Chinese age, and total days alive, plus find yo…
- [100 Day Calculator (Baby's Hundred Days)](https://www.toolkk.com/tools/baby-hundred-days-calculator): Enter your baby's birth date to instantly view the Gregorian and Lunar dates, as well as the day of the week, for their…
- [Bazi to Gregorian Calendar Converter](https://www.toolkk.com/tools/horoscope-solar-converter): Free online two-way converter for Gregorian dates and Bazi (Four Pillars of Destiny). Supports Ziwei and Ziping school R…
- [Lunar and Solar Calendar Converter](https://www.toolkk.com/tools/lunar-solar-converter): A tool for converting dates between the lunar and solar calendars. It supports lunar leap months and is ideal for lookin…
- [First Seven Mourning Date Calculator](https://www.toolkk.com/tools/death-seventh-calculator): Accurately calculate traditional memorial dates including the First Seven, Third Seven, Fifth Seven, and Seventh Seven.…
- [Countdown Calculator](https://www.toolkk.com/tools/countdown-day-calculator): Calculate the exact countdown to any future date. Supports both Gregorian and Lunar calendars, displaying the remaining…
- [Day of the Year Calculator](https://www.toolkk.com/tools/day-of-year-calculator): Quickly calculate the day of the year, days remaining, and convert between lunar and solar calendars.
- [Date Difference Calculator](https://www.toolkk.com/tools/date-diff-calculator): Accurately calculate the time difference between two dates. Get results in years, months, weeks, days, hours, minutes, a…
- [Death Anniversary Calculator](https://www.toolkk.com/tools/death-anniversary-calculator): Automatically calculate important memorial milestones like the 1st and 3rd death anniversaries. Supports Gregorian and L…
- [UNIX Timestamp Converter](https://www.toolkk.com/tools/unix-timestamp-converter): Instantly convert between human-readable dates and UNIX timestamps (seconds/milliseconds). Perfect for development, debu…
- [Leap Year Calculator](https://www.toolkk.com/tools/leap-year-calculator): Check if a year is a leap year based on Gregorian calendar rules, or generate a list of all leap years within a specific…
- [Historical Events Lookup](https://www.toolkk.com/tools/today-in-history): Look up major historical events and famous figures for any date.
- [Date Calculator: Add or Subtract Days](https://www.toolkk.com/tools/date-calculator): Add or subtract years, months, weeks, and days from a specific date to quickly calculate your target date.
- [Lunar New Year's Eve Countdown](https://www.toolkk.com/tools/china-nye-countdown): Live countdown displaying the exact days and time left until Lunar New Year's Eve to help you prepare for the Spring Fes…
- [Flip Clock](https://www.toolkk.com/tools/page-turning-clock): Large-digit flip clock to boost focus during work and study. Features full-screen mode and customizable time formats.
- [Chinese New Year Countdown](https://www.toolkk.com/tools/china-cny-countdown): Real-time countdown calculating the exact days, hours, minutes, and seconds until the Lunar New Year. No manual input re…
- [Christmas Countdown](https://www.toolkk.com/tools/christmas-countdown): Accurately calculate the remaining days, hours, minutes, and seconds until Christmas. An essential tool for your holiday…
- [New Year's Day Countdown](https://www.toolkk.com/tools/new-year-day-countdown): Accurately calculates the countdown to January 1st of the upcoming year, with real-time updates for days, hours, minutes…
- [Confucius Birthday Countdown](https://www.toolkk.com/tools/china-confucius-birthday-countdown): Automatically calculate the days remaining until September 28 to celebrate Confucian culture.
- [Mid-Autumn Festival Countdown](https://www.toolkk.com/tools/china-moon-festival-countdown): Real-time countdown to the Mid-Autumn Festival (August 15th on the lunar calendar) to help you plan your family reunion.
- [War to Resist US Aggression and Aid Korea Memorial Day Countdown](https://www.toolkk.com/tools/china-cdrusaak-countdown): Real-time calculation of the exact time remaining until the War to Resist US Aggression and Aid Korea Memorial Day on Oc…
- [National Day Countdown](https://www.toolkk.com/tools/china-national-countdown): Automatically calculates the time remaining until National Day. Get real-time updates on days, hours, minutes, and secon…
- [Xinhai Revolution Countdown](https://www.toolkk.com/tools/china-xinhai-revolution-countdown): Automatically calculate the exact days, hours, minutes, and seconds left until the Xinhai Revolution anniversary with li…
- [Martyrs' Day Countdown Timer](https://www.toolkk.com/tools/china-martyr-memorial-countdown): A live countdown timer displaying the exact days, hours, minutes, and seconds until Martyrs' Day to help you remember hi…
- [Buddhist Calendar Converter](https://www.toolkk.com/tools/buddhist-calendar): A two-way date converter for Gregorian and Buddhist calendars. Accurately calculate Buddhist eras with support for multi…
- [Taoist Calendar Converter](https://www.toolkk.com/tools/taoism-calendar): Enter a Gregorian date to get Taoist cultural date information including the Taoist calendar, Stems and Branches, solar…
- [Qingming Festival Countdown](https://www.toolkk.com/tools/china-qingming-countdown): Real-time countdown to Qingming Festival (April 5th) to help you efficiently plan your Tomb-Sweeping Day schedule.
- [Winter Solstice Countdown](https://www.toolkk.com/tools/winter-solstice-countdown): Real-time display of the exact days, hours, and minutes remaining until the Winter Solstice to help you plan your activi…
- [National Love Your Teeth Day Countdown](https://www.toolkk.com/tools/china-teeth-care-countdown): Automatically calculates the days remaining until National Love Your Teeth Day on September 20th, reminding you to prior…
- [Qixi Festival Countdown](https://www.toolkk.com/tools/china-valentine-countdown): Automatically calculates the remaining days until the Qixi Festival (7th day of the 7th lunar month) and its correspondi…
- [Double Ninth Festival Countdown](https://www.toolkk.com/tools/china-chongyang-countdown): Automatically calculates the days remaining until the 9th day of the 9th lunar month (Double Ninth Festival) to help you…
- [National Memorial Day Countdown](https://www.toolkk.com/tools/china-npmd-countdown): Live countdown timer tracking the days, hours, minutes, and seconds until the December 13 National Memorial Day to help…
- [Laba Festival Countdown](https://www.toolkk.com/tools/china-laba-countdown): Automatically calculate the Laba Festival countdown. View the remaining days until the 8th day of the 12th lunar month i…
- [Teachers' Day Countdown](https://www.toolkk.com/tools/china-teachers-day-countdown): Instantly calculates and displays the exact time remaining until Chinese Teachers' Day on September 10th. No manual setu…
- [Week of the Year Calculator](https://www.toolkk.com/tools/week-calculator): Quickly and accurately calculate what week of the year it is today.
- [Xiayuan Festival Countdown](https://www.toolkk.com/tools/china-xiayuan-countdown): Real-time countdown to the 15th day of the 10th lunar month to help you plan traditional festival activities.
- [Northern Little New Year Countdown](https://www.toolkk.com/tools/china-northern-xiaonian-countdown): Automatically calculates the days remaining until the 23rd of the 12th lunar month, helping users track the exact date o…
- [Chinese Almanac Calendar](https://www.toolkk.com/tools/today-almanac): Provides lunar-solar calendar conversion, daily auspicious/inauspicious activities, and solar terms for traditional Chin…
- [Chinese Young Pioneers Anniversary Countdown](https://www.toolkk.com/tools/china-young-pioneers-countdown): Real-time calculation of the days remaining until the Chinese Young Pioneers Founding Anniversary (October 13) to help u…
- [Start of Winter (Lidong) Countdown](https://www.toolkk.com/tools/beginning-winter-countdown): Accurately calculates the remaining time until the Start of Winter (Lidong) solar term. Displays real-time days, hours,…
- [Dragon Boat Festival Countdown Timer](https://www.toolkk.com/tools/china-duanwu-countdown): Automatically calculates the days remaining until the Dragon Boat Festival. Get real-time updates instantly to help you…
- [Tiankuang Festival Countdown](https://www.toolkk.com/tools/china-tiankuang-countdown): Zero-setup live countdown to the Tiankuang Festival (6th day of the 6th lunar month). Automatically handles lunar to Gre…
- [Frost's Descent Countdown](https://www.toolkk.com/tools/first-frost-countdown): Accurately calculate the countdown to the Frost's Descent solar term, displaying remaining days, hours, and minutes in r…
- [Hanyi Festival Countdown Timer](https://www.toolkk.com/tools/china-hanyi-countdown): Automatically calculates the exact remaining days until the Hanyi Festival on the 1st day of the 10th lunar month, helpi…
- [Business Days Calculator](https://www.toolkk.com/tools/workday-calculator): Accurately calculate the number of business days by automatically excluding weekends and custom holidays.
- [Sunrise and Sunset Times by City](https://www.toolkk.com/tools/city-sunrise-sunset-query): Accurately calculate sunrise and sunset times, as well as daylight hours, for any location worldwide. Supports 30 years…
- [Weiya Countdown](https://www.toolkk.com/tools/china-weiya-countdown): Accurately calculate the remaining days until the lunar Weiya banquet to help you easily plan your year-end celebration.
- [Deng Xiaoping Death Anniversary Countdown](https://www.toolkk.com/tools/china-deng-xiaoping-countdown): Automatically calculates the days remaining until February 19th each year. Get instant countdown results with zero input…
- [Learn from Lei Feng Day Countdown](https://www.toolkk.com/tools/china-lei-feng-countdown): Instantly calculate the days left until Learn from Lei Feng Day on March 5 to help you prepare for commemorative events…
- [Chinese People's Police Day Countdown](https://www.toolkk.com/tools/china-cppd-countdown): Automatically displays the remaining days until Chinese People's Police Day. A handy holiday countdown tool.
- [Hungry Ghost Festival Countdown](https://www.toolkk.com/tools/china-zhongyuan-countdown): Displays a real-time Hungry Ghost Festival countdown, accurate to the minute, to help you plan memorial activities.
- [Zhou Enlai Death Anniversary Countdown](https://www.toolkk.com/tools/china-zhou-enlai-countdown): Automatically calculates the live countdown to the anniversary of Zhou Enlai's passing on January 8th, helping users com…
- [Exam Countdown Timer](https://www.toolkk.com/tools/china-gaokao-countdown): A versatile date countdown tool. Set any target date and get real-time updates on remaining days, hours, minutes, and se…
- [Start of Spring (Lichun) Countdown Calculator](https://www.toolkk.com/tools/beginning-spring-countdown): Real-time calculation of the exact days, hours, minutes, and seconds until the traditional Chinese solar term, Start of…
- [Longtaitou Festival Countdown](https://www.toolkk.com/tools/china-longtaitou-countdown): Accurately calculate the countdown to the 2nd day of the 2nd lunar month. Automatically identifies the current date and…
- [Lantern Festival Countdown](https://www.toolkk.com/tools/china-lantern-countdown): Automatically calculate the remaining days, hours, and minutes until the Lantern Festival (15th day of the first lunar m…
- [God of Wealth Festival Countdown](https://www.toolkk.com/tools/china-caishen-countdown): Displays a real-time countdown to the God of Wealth Festival on Lunar July 22, helping users plan offerings or business…
- [National 110 Campaign Day Countdown Timer](https://www.toolkk.com/tools/china-national-110-pub-countdown): Instantly view the days remaining until National 110 Campaign Day on January 10th. Easily track this annual police safet…
- [Southern Little New Year Countdown](https://www.toolkk.com/tools/china-southern-xiaonian-countdown): Accurately calculate the days remaining until the 24th day of the 12th lunar month to plan your festival activities in a…
- [Major Cold Countdown](https://www.toolkk.com/tools/major-cold-countdown): Calculate the exact real-time countdown to the Major Cold solar term and explore traditional Chinese calendar culture.
- [Air Force Founding Day Countdown](https://www.toolkk.com/tools/air-force-founding-countdown): Accurately calculates the remaining days until Air Force Founding Day on November 11, with automatic annual updates.
- [Major Snow Countdown](https://www.toolkk.com/tools/major-snow-countdown): Get a precise, real-time countdown to the Major Snow solar term to help you plan ahead for the winter season.
- [National Ear Care Day Countdown Calculator](https://www.toolkk.com/tools/china-ear-care-countdown): Instantly track the days remaining until National Ear Care Day to stay on top of your hearing health.
- [Chinese Farmers' Harvest Festival Countdown](https://www.toolkk.com/tools/china-farmers-harvest-countdown): Accurately displays the days remaining until the Chinese Farmers' Harvest Festival on September 23, helping you track th…
- [Army Day Countdown](https://www.toolkk.com/tools/pla-anniversary-countdown): Automatically calculates the remaining days, hours, minutes, and seconds until Army Day on August 1st. View the live cou…
- [Cold Dew Countdown](https://www.toolkk.com/tools/cold-dew-countdown): Calculate the exact time remaining until the Cold Dew solar term with a real-time countdown down to the second, helping…
- [Minor Snow Countdown](https://www.toolkk.com/tools/minor-snow-countdown): Accurately calculate the remaining days until the Minor Snow solar term. Automatically displays a countdown and provides…
- [Rain Water Solar Term Countdown](https://www.toolkk.com/tools/rain-water-countdown): Calculates and displays the exact time remaining until the next Rain Water (Yushui) solar term in real time, helping you…
- [Tiancang Festival Countdown Calculator](https://www.toolkk.com/tools/china-tiancang-countdown): Automatically calculate the days remaining until the Tiancang Festival (25th day of the 1st lunar month) to help you pla…
- [China Dream Day Countdown Calculator](https://www.toolkk.com/tools/china-dream-day-countdown): Calculate the days remaining until Dream Day on November 29 to help you plan your life goals.
- [Sun Yat-sen Birthday Countdown](https://www.toolkk.com/tools/sun-yat-sen-birthday-day-countdown): Automatically calculate the days remaining until Sun Yat-sen's birthday on November 12.
- [Patriotic Health Month Countdown](https://www.toolkk.com/tools/china-npphm-countdown): Accurately calculate the time remaining until the start of National Patriotic Health Month on April 1 every year.
- [Awakening of Insects Countdown Calculator](https://www.toolkk.com/tools/awakening-insects-countdown): Accurately calculate the real-time countdown to the Awakening of Insects (Jingzhe) solar term. Displays days, hours, min…
- [Cold Dew Countdown](https://www.toolkk.com/tools/hanlu-countdown): Automatically calculate the real-time remaining days, hours, and seconds until the Cold Dew solar term. No date input re…
- [Po Wu Festival Countdown Timer](https://www.toolkk.com/tools/china-pwf-countdown): Automatically calculates the countdown to the 5th day of the Lunar New Year, displaying remaining days, hours, minutes,…
- [National Love Your Liver Day Countdown](https://www.toolkk.com/tools/china-national-protect-liver-countdown): Calculate the remaining days until National Love Your Liver Day on March 18 in real-time to help you stay focused on liv…
- [V-J Day Countdown (Sept 3)](https://www.toolkk.com/tools/victory-over-japan-countdown): Automatically calculate the remaining days until the annual September 3 V-J Day anniversary without manual date input.
- [Autumnal Equinox Countdown](https://www.toolkk.com/tools/autumn-equinox-countdown): Automatically calculates the exact countdown from the current time to the autumnal equinox, including days, hours, and m…
- [July 7 Incident Countdown](https://www.toolkk.com/tools/july-7th-incident-anniversary-countdown): Automatically calculate the remaining days from today until the July 7 Incident anniversary. Supports cross-year trackin…
- [Hanshi Festival Countdown](https://www.toolkk.com/tools/china-cold-food-countdown): Automatically calculates the remaining days and time until the Hanshi Festival (Lunar March 4th), helping you plan tradi…
- [Mazu Birthday Countdown](https://www.toolkk.com/tools/china-mazu-bday-countdown): Accurately calculate the days remaining until Mazu's birthday (3rd month, 23rd day of the lunar calendar) to help plan y…
- [Macau Handover Countdown](https://www.toolkk.com/tools/macao-handover-anniversary-countdown): Accurately calculate the remaining days until the December 20 Macau Handover Anniversary, updated in real-time down to t…
- [Minor Cold Countdown](https://www.toolkk.com/tools/minor-cold-countdown): Accurately calculate the exact days, hours, minutes, and seconds remaining until the Minor Cold solar term in real time.
- [Student Safety Education Day Countdown](https://www.toolkk.com/tools/china-national-school-safety-countdown): Automatically calculate the remaining days until National Student Safety Education Day on March 28 to help schools and f…
- [Days Until May Fourth Youth Day Calculator](https://www.toolkk.com/tools/china-youth-countdown): Automatically calculate the exact number of days left until May Fourth Youth Day.
- [Lixia (Start of Summer) Countdown Calculator](https://www.toolkk.com/tools/beginning-summer-countdown): Accurately calculate the remaining days, hours, minutes, and seconds until the Lixia (Start of Summer) solar term.
- [Journalists' Day Countdown Calculator](https://www.toolkk.com/tools/china-journalists-countdown): Accurately calculate the days remaining until Chinese Journalists' Day on November 8 to help media professionals plan th…
- [Mao Zedong Birthday Countdown](https://www.toolkk.com/tools/mao-zedong-birthday-countdown): Accurately calculate the remaining time until Mao Zedong's birthday (December 26), updating days, hours, minutes, and se…
- [Traditional Chinese Medicine Day Countdown](https://www.toolkk.com/tools/china-national-medical-countdown): Automatically calculate the remaining days until Traditional Chinese Medicine Day on March 17.
- [Grain Rain Countdown](https://www.toolkk.com/tools/grain-rain-countdown): Calculate the exact time remaining until the Grain Rain solar term in real time. Perfect for tracking agricultural event…
- [CPC Founding Day Countdown](https://www.toolkk.com/tools/cpc-founding-day-countdown): Accurately calculate the days, hours, minutes, and seconds remaining until CPC Founding Day on July 1st with this real-t…
- [Hua Zhao Festival Countdown](https://www.toolkk.com/tools/china-huachao-countdown): Automatically calculate the days remaining until the Hua Zhao Festival and celebrate traditional Chinese culture.
- [Xi'an Incident Anniversary Countdown](https://www.toolkk.com/tools/xi'an-incident-anniversary-countdown): Accurately calculate the countdown to the Xi'an Incident anniversary with automatic cross-year adjustment and no manual…
- [National Traffic Safety Day Countdown](https://www.toolkk.com/tools/national-traffic-safety-countdown): Automatically calculate the days remaining until National Traffic Safety Day on December 2 to help raise public safety a…
- [White Dew Countdown](https://www.toolkk.com/tools/white-dew-countdown): Live countdown to the exact day of the White Dew solar term, promoting traditional Chinese culture.
- [Summer Solstice Countdown](https://www.toolkk.com/tools/summer-solstice-countdown): Calculate the remaining days, hours, minutes, and seconds until the next Summer Solstice in real time to easily track im…
- [Fire Prevention Day Countdown](https://www.toolkk.com/tools/national-fire-countdown): Real-time countdown to National Fire Prevention Day on November 9th to help boost fire safety awareness campaigns.
- [Spring Equinox Countdown](https://www.toolkk.com/tools/spring-equinox-countdown): Calculate the exact time remaining until the Spring Equinox to track astronomical seasons and plan your spring activitie…
- [Space Day of China Countdown](https://www.toolkk.com/tools/china-space-day-countdown): Automatically calculates the remaining days until Space Day of China on April 24th every year. Real-time updates with no…
- [National Security Education Day Countdown](https://www.toolkk.com/tools/national-security-education-day-countdown): Automatically calculates the exact time remaining until National Security Education Day on April 15th each year, display…
- [Qingming Festival Countdown Calculator](https://www.toolkk.com/tools/qingming-festival-countdown): Real-time countdown to the Qingming Festival. Get the exact days remaining to help plan your Tomb-Sweeping Day and trave…
- [Chushu (End of Heat) Countdown](https://www.toolkk.com/tools/end-of-heat-countdown): Accurately calculate the real-time remaining time until the next Chushu (End of Heat) solar term, featuring automatic cr…
- [National Malaria Day Countdown](https://www.toolkk.com/tools/national-malaria-day-countdown): Automatically calculates the days remaining until National Malaria Day on April 26 to help you plan health awareness act…
- [Zaomatou Lunar Calendar Converter](https://www.toolkk.com/tools/zaomatou): Check Chinese lunar dates, solar terms, festivals, and zodiac signs online. Supports Gregorian to Lunar conversion and m…
- [National Entrepreneurs' Day Countdown](https://www.toolkk.com/tools/national-entrepreneur-activity-countdown): Automatically calculate the real-time countdown to National Entrepreneurs' Day on April 21 to help businesses and indivi…
- [National Traffic Safety Reflection Day Countdown](https://www.toolkk.com/tools/national-traffic-safety-reflection-countdown): Accurately calculates the days remaining until Traffic Safety Reflection Day on April 30, reminding the public to priori…
- [First Day of Fall Countdown](https://www.toolkk.com/tools/start-autumn-countdown): Real-time countdown to the exact start of the first day of fall.
- [Mangzhong (Grain in Ear) Countdown](https://www.toolkk.com/tools/grain-in-ear-countdown): Accurately calculate the remaining days until the Mangzhong (Grain in Ear) solar term to assist with agricultural planni…
- [Major Heat Countdown](https://www.toolkk.com/tools/major-heat-countdown): Calculate the remaining days until the Major Heat (Dashu) solar term in real time and use traditional solar term timing…
- [Minor Heat Countdown](https://www.toolkk.com/tools/minor-heat-countdown): Automatically calculate the days left until Minor Heat. No input needed to view a real-time countdown for this tradition…
- [Days Lived Calculator](https://www.toolkk.com/tools/days-lived-calculator): Calculate exactly how many days you've lived since your date of birth. This free online calculator supports custom start…
- [Xiaoman Solar Term Countdown](https://www.toolkk.com/tools/grain-buds-countdown): Accurately calculate the countdown to the Xiaoman solar term, displaying remaining days, hours, minutes, and seconds to…
- [Beijing Time Sync](https://www.toolkk.com/tools/beijing-time-query): Online tool to sync Beijing Time and UTC, accurately calculating the time difference.
- [Random Date Generator](https://www.toolkk.com/tools/random-date): Accurately generate random dates within a specified range, ideal for software testing and data simulation.
- [Father's Day Countdown](https://www.toolkk.com/tools/fathers-day-countdown): Real-time calculator for the days, hours, and minutes left until Father's Day. Plan your celebration early.
- [World City Time](https://www.toolkk.com/tools/world-time-query): Real-time global city time tracker and time zone converter
- [4th of July Countdown](https://www.toolkk.com/tools/us-independence-day-countdown): Live countdown to the 4th of July. Automatically updates to the exact second with no manual calculation required.
- [Children's Day Countdown Timer](https://www.toolkk.com/tools/childrens-day-countdown): Accurately calculate the time remaining until Children's Day on June 1st. Displays a live timer in days, hours, minutes,…
- [Mother's Day Countdown](https://www.toolkk.com/tools/mothers-day-countdown): Automatically calculates the date for Mother's Day each year and displays a real-time countdown in days, hours, minutes,…
- [French Revolution Countdown](https://www.toolkk.com/tools/french-revolution-countdown): A precise live countdown to the French Revolution anniversary (Bastille Day), displaying the exact days, hours, minutes,…
- [El Salvador Teachers' Day: Date & Information](https://www.toolkk.com/tools/el-salvador-teachers-day-countdown): Look up the exact date, historical background, traditions, and significance of Teachers' Day in El Salvador with our aut…
- [Valentine's Day Countdown](https://www.toolkk.com/tools/valentines-day-countdown): Calculate the exact days, hours, and seconds until Valentine's Day on February 14th in real-time to help you plan the pe…
- [Apollo 11 Anniversary Countdown](https://www.toolkk.com/tools/apollo-11-countdown): Track the Apollo 11 moon landing anniversary with a real-time display of the exact time remaining until this historic mi…
- [World War II End Countdown](https://www.toolkk.com/tools/end-of-ww2-countdown): Real-time countdown tracking the exact time since the end of World War II, accurate to the second.
- [Halloween Countdown Timer](https://www.toolkk.com/tools/halloween-countdown): Calculates the time remaining until Halloween on October 31st in real-time, helping users plan their holiday events.
- [United Nations Day Countdown](https://www.toolkk.com/tools/un-founding-countdown): Live countdown timer tracking the exact time remaining until the United Nations anniversary. Ideal for event planning an…
- [Iranian Teachers' Day Date Converter](https://www.toolkk.com/tools/iran-teachers-day-countdown): Accurately convert 12 Ordibehesht from the Iranian calendar to the Gregorian date, complete with holiday background and…
- [Mexican Teacher's Day: Date, History & Traditions](https://www.toolkk.com/tools/mexico-teachers-day-countdown): Find the exact date, history, traditions, and cultural background of Mexican Teacher's Day to better understand Mexico's…
- [Mahatma Gandhi Birthday Countdown](https://www.toolkk.com/tools/gandhi-birthday-countdown): Accurately calculate the time remaining until Mahatma Gandhi's birthday on October 2nd. Features real-time tracking and…
- [Malaysia Teachers' Day Date Lookup](https://www.toolkk.com/tools/malaysia-teachers-day-countdown): Discover the exact date, historical background, and celebration traditions of Teachers' Day in Malaysia.
- [Teachers' Day in Honduras](https://www.toolkk.com/tools/honduras-teachers-day-countdown): Find the date, historical background, and celebration traditions of Teachers' Day in Honduras to understand its educatio…
- [Argentina Teachers' Day Info](https://www.toolkk.com/tools/argentina-teachers-day-countdown): A tool to look up detailed information on the date, historical background, celebration methods, and cultural significanc…
- [Fall of the Berlin Wall Countdown](https://www.toolkk.com/tools/berlin-wall-fall-countdown): View a live, exact countdown to the anniversary of the fall of the Berlin Wall and commemorate this historic moment.
- [Guide to Teachers' Day in Spain: Date & Celebrations](https://www.toolkk.com/tools/spain-teachers-day-countdown): Find the exact date, historical background, and common traditions of Teachers' Day in Spain to quickly understand its cu…
- [Costa Rica Teachers' Day: Date, History & Traditions](https://www.toolkk.com/tools/costa-rica-teachers-day-countdown): Find the date, origins, and traditions of Costa Rica Teachers' Day to explore local cultural customs.
- [April Fools' Day Countdown](https://www.toolkk.com/tools/april-fools-day-countdown): Automatically calculates the remaining days, hours, minutes, and seconds until April Fools' Day on April 1st each year.…
- [Panama Teachers' Day: Date, History & Information](https://www.toolkk.com/tools/panama-teachers-day-countdown): Find the date, history, and traditions of Panama Teachers' Day, and explore its educational and cultural significance.
- [Guatemala Teacher's Day Date](https://www.toolkk.com/tools/guatemala-teachers-day-countdown): Find the exact date, historical background, celebration customs, and cultural significance of Teacher's Day in Guatemala…
- [UK Teachers' Day Date Checker](https://www.toolkk.com/tools/uk-teachers-day-countdown): Provides accurate dates, background information, and celebration methods for UK teacher appreciation events to help you…
- [Sudan Teachers' Day Date Finder](https://www.toolkk.com/tools/sudan-teachers-day-countdown): Check the date, historical background, and celebration customs for Sudan Teachers' Day. Features bilingual support and e…
- [Thailand Teacher's Day: Date & Cultural Customs](https://www.toolkk.com/tools/thailand-teachers-day-countdown): Check the fixed date of Thailand Teacher's Day and learn about cultural customs like the Wai Kru ceremony, traditional c…
- [Martin Luther King Jr. Day Countdown](https://www.toolkk.com/tools/martin-luther-king-day-countdown): Accurately calculate the time remaining until Martin Luther King Jr. Day. Automatically tracks the third Monday in Janua…
- [Vietnam Teachers' Day Date Lookup](https://www.toolkk.com/tools/vietnam-teachers-day-countdown): Look up the exact date, historical background, and cultural traditions of Vietnam Teachers' Day to learn more about this…
- [Russian Teacher's Day Date Finder](https://www.toolkk.com/tools/russia-teachers-day-countdown): Find the exact date, historical background, and celebration customs of Teacher's Day in Russia for event planning and cu…
- [Brazil Teachers' Day: Date, Origins & Customs](https://www.toolkk.com/tools/brazil-teachers-day-countdown): Find the exact date, historical origins, and celebration customs of Teachers' Day in Brazil. Ideal for students, educato…
- [Legal Awareness Day Countdown](https://www.toolkk.com/tools/national-legal-awareness-countdown): Automatically calculates the remaining days from today until National Legal Awareness Day on December 4th.
- [Indian Teachers' Day Dates and Customs](https://www.toolkk.com/tools/india-teachers-day-countdown): Check Indian Teachers' Day dates, cultural backgrounds, and celebration customs. Learn the differences between Guru Purn…
- [Turkish Teachers' Day](https://www.toolkk.com/tools/turkey-teachers-day-countdown): Find the date, history, and celebrations of Turkish Teachers' Day, and explore Turkey's unique educational culture.
- [South Korean Teacher's Day Date Checker](https://www.toolkk.com/tools/south-korea-teachers-day-countdown): Get the date, historical origins, and celebration customs of Teacher's Day in South Korea. Perfect for students, teacher…
- [Hungarian Teachers' Day Date & Countdown Calculator](https://www.toolkk.com/tools/hungary-teachers-day-countdown): Check the exact date, countdown, and celebration traditions for Hungarian Teachers' Day. Learn about its cultural backgr…
- [Albanian Teachers' Day: Date, History & Info](https://www.toolkk.com/tools/albania-teachers-day-countdown): Find the exact date, historical origins, celebration customs, and cultural background of Albanian Teachers' Day.
- [Thanksgiving Countdown](https://www.toolkk.com/tools/thanksgiving-countdown): Accurately calculate the live countdown to US Thanksgiving to help you plan your holiday schedule and celebrations in ad…
- [Czech Teachers' Day Date](https://www.toolkk.com/tools/czech-teachers-day-countdown): Find the exact date, historical background, and local celebration traditions of Czech Teachers' Day to quickly understan…
- [Nelson Mandela International Day Countdown Timer](https://www.toolkk.com/tools/nelson-mandela-day-countdown): Track the exact time remaining until Mandela Day. A live timer displaying days, hours, minutes, and seconds for this imp…
- [Romania Teachers' Day Date Checker](https://www.toolkk.com/tools/romania-teachers-day-countdown): Check the exact date of Teachers' Day in Romania and learn about its historical background and celebration customs.
- [World Teachers' Day Information](https://www.toolkk.com/tools/world-teachers-day-countdown): Provides the date, history, celebration ideas, and UNESCO information for World Teachers' Day.
- [Sun Yat-sen Death Anniversary Lookup](https://www.toolkk.com/tools/china-lsun-yat-sen-countdown): Accurately check Dr. Sun Yat-sen's death anniversary (March 12) and explore its historical background.
- [Age Difference Calculator](https://www.toolkk.com/tools/age-diff-calculator): Calculate the exact age difference between two people or dates. Get precise time interval analysis in years, months, and…

## Finance (118)

> Mortgage/Personal Income Tax/Loan Interest Rate Calculator, Real-time Exchange Rate Conversion, Invoice Verification, Convenient Financial Decision Tools

- [CAGR Calculator](https://www.toolkk.com/tools/cagr-calculator): Calculate the Compound Annual Growth Rate (CAGR) of your investments. Enter the initial value, final value, and number o…
- [FVIFA Calculator](https://www.toolkk.com/tools/fvifa-calculator): Calculate the Future Value Interest Factor of an Annuity (FVIFA) instantly. Enter your interest rate and periods to esti…
- [Bond YTM Calculator](https://www.toolkk.com/tools/bond-ytm-calculator): Enter the face value, market price, coupon rate, and time to maturity to accurately calculate the annualized yield to ma…
- [Chinese RMB Amount Converter](https://www.toolkk.com/tools/rmb-case-convert): Accurately convert between numeric amounts and Chinese uppercase/lowercase financial characters to meet formatting stand…
- [Return on Investment (ROI) Calculator](https://www.toolkk.com/tools/roi-calculator): Enter your investment amount and dates to quickly calculate ROI and annualized return, helping you make smarter investme…
- [Stamp Duty Calculator](https://www.toolkk.com/tools/stamp-duty-calculator): Calculate the payable tax for various contracts, documents, and account books based on the Stamp Duty Law. Supports both…
- [VAT Calculator](https://www.toolkk.com/tools/vat-calculator): Quickly calculate VAT-inclusive prices, VAT-exclusive prices, and tax amounts with this free online VAT calculator. Supp…
- [Freelance Income Tax Calculator](https://www.toolkk.com/tools/service-remuneration-individual-income-tax-calculator): Accurately calculate personal income tax and after-tax income for freelance work. Ideal for design, consulting, and othe…
- [APR Calculator](https://www.toolkk.com/tools/apr-calculator): Calculate the true annualized cost of a loan, including interest and extra fees, to reveal your actual borrowing burden.
- [Quick Ratio Calculator](https://www.toolkk.com/tools/acid-test-ratio-calculator): Quickly calculate your business quick ratio to evaluate short-term liquidity and support financial decision-making.
- [Early Mortgage Payoff Calculator](https://www.toolkk.com/tools/mortgage-early-repayment-calculator): Accurately calculate changes to your monthly payment, interest saved, and shortened loan terms with extra mortgage payme…
- [Chart of Accounts Lookup](https://www.toolkk.com/tools/accounting-subject-query): Look up standard account codes, names, and usage under enterprise accounting standards. Covers six major categories like…
- [Test Credit Card Number Generator](https://www.toolkk.com/tools/random-bank-card-number): Generate test bank and credit card numbers that pass the Luhn algorithm validation. Supports major card networks includi…
- [Net to Gross Salary Calculator](https://www.toolkk.com/tools/after-tax-salary-calculator): Accurately reverse-calculate your gross salary and individual income tax, with support for social security and housing f…
- [ROCE Calculator](https://www.toolkk.com/tools/roce-calculator): Calculate Return on Capital Employed (ROCE) online by entering EBIT, total assets, and current liabilities to evaluate b…
- [APY Calculator](https://www.toolkk.com/tools/apy-calculator): Enter the nominal interest rate and compounding periods to accurately calculate your Annual Percentage Yield (APY) and m…
- [Auto Loan Calculator](https://www.toolkk.com/tools/auto-loan-calculator): Accurately calculate auto loan monthly payments and interest. Supports both fixed payment and fixed principal methods to…
- [Return on Equity (ROE) Calculator](https://www.toolkk.com/tools/roe-calculator): Enter net income and shareholder equity to instantly calculate your ROE percentage. A perfect tool for investors evaluat…
- [Actual Cash Value (ACV) Calculator](https://www.toolkk.com/tools/acv-calculator): Calculate the depreciated value of an item based on its replacement cost, expected lifespan, and current age. Ideal for…
- [Return on Net Assets (RONA) Calculator](https://www.toolkk.com/tools/rona-calculator): Calculate Return on Net Assets (RONA) to evaluate asset profitability. Perfect for financial analysis and investment dec…
- [Bond Current Yield (BCY) Calculator](https://www.toolkk.com/tools/bcy-calculator): Enter the bond price, face value, and coupon rate to quickly calculate the Bond Current Yield (BCY) for smarter investme…
- [Court Fee Calculator](https://www.toolkk.com/tools/legal-fees-calculator): Accurately calculate court filing fees based on the Measures on the Payment of Litigation Costs. Supports 6 case types i…
- [Bond Equivalent Yield (BEY) Calculator](https://www.toolkk.com/tools/bey-calculator): A Bond Equivalent Yield calculator designed for financial professionals. Enter the face value, purchase price, and days…
- [Personal Pension Calculator](https://www.toolkk.com/tools/pension-calculator): Estimate your future retirement pension income with customizable parameters.
- [Average Collection Period Calculator](https://www.toolkk.com/tools/acp-calculator): A financial analysis tool to accurately calculate accounts receivable turnover and assess corporate cash flow health.
- [Property Deed Tax Calculator](https://www.toolkk.com/tools/house-deed-tax-calculator): Accurately calculate property deed tax, stamp duty, and other fees to help you plan your home buying budget.
- [Income Tax Calculator](https://www.toolkk.com/tools/individual-income-tax-calculator): Calculate individual income tax based on the latest Chinese tax laws. Supports 5 income types, including salary and labo…
- [Social Security and Housing Fund Calculator](https://www.toolkk.com/tools/insurance-housing-fund-calculator): Accurately calculate employee and employer contributions for Social Security and Housing Fund, with customizable bases a…
- [Car Insurance Quote Calculator (2026)](https://www.toolkk.com/tools/car-insurance-quote-calculator): Quickly estimate your annual car insurance premiums, including mandatory and commercial coverage. Enter your car's value…
- [Car Purchase Tax Calculator (2026)](https://www.toolkk.com/tools/car-purchase-tax-calculator-2026): Enter the new car's invoice price and instantly calculate 2026 vehicle purchase tax and total landed cost
- [Bulk Bank Card BIN Checker](https://www.toolkk.com/tools/bankcard-bin-batch-query): Batch lookup issuing bank, region, and card type using the first 6 digits of a bank card (BIN). Supports CSV import and…
- [Combination Mortgage Calculator](https://www.toolkk.com/tools/combined-housing-loan-calculator): Calculate monthly payments and interest for mixed HPF and commercial mortgages, complete with detailed amortization sche…
- [Bulk 2-Element Bank Card Verification](https://www.toolkk.com/tools/bankcard-two-factor-batch-verify): Bulk verify the match between bank card numbers and cardholder names to prevent financial fraud.
- [Historical Exchange Rate Lookup](https://www.toolkk.com/tools/history-currency-rate-query): Look up historical Bank of China exchange rates for specific date ranges. Get accurate currency conversion data for fina…
- [Year-End Bonus Tax Calculator](https://www.toolkk.com/tools/annual-bonus-individual-tax-calculator): Accurately calculate your year-end bonus income tax. Supports both separate and comprehensive tax methods to instantly d…
- [Currency Converter](https://www.toolkk.com/tools/currency-rate-converter): A real-time currency converter supporting major global currencies, providing accurate foreign exchange calculations.
- [Top 10 Bank Exchange Rates](https://www.toolkk.com/tools/top10-bank-currency-rate-query): Check live exchange rates from China's top 10 banks, compare foreign exchange rates instantly, and convert currencies.
- [Tax Late Fee Calculator](https://www.toolkk.com/tools/tax-late-fee-calculator): Enter your unpaid tax amount and overdue days to quickly calculate your tax late fees online.
- [Stock Trading Fee Calculator](https://www.toolkk.com/tools/stock-trading-fee-calculator): Calculate stock trading fees instantly. Get a clear breakdown of commissions, stamp duty, and transfer fees for your tra…
- [RMB Unit Converter](https://www.toolkk.com/tools/rmb-unit-converter): Free online Chinese Renminbi (RMB) unit converter. Easily convert between Yuan, Jiao, and Fen by entering the amount and…
- [Bank Card BIN Lookup](https://www.toolkk.com/tools/bankcard-bin-query): Enter a bank card number to instantly check the issuing bank, location, card type, and customer service phone number. Su…
- [E-commerce ROI Calculator](https://www.toolkk.com/tools/ecommerce-roi-calculator): E-commerce advertising ROI/ROAS profit and loss calculator that accounts for profit margins, return rates, and hidden co…
- [Provident Fund Loan Calculator](https://www.toolkk.com/tools/housing-fund-loan-calculator): Accurately calculate your provident fund loan monthly payments and total interest. Supports both fixed payment and fixed…
- [Housing Provident Fund Loan Calculator](https://www.toolkk.com/tools/housing-provident-fund-loan-calculator): Accurately calculate your Housing Provident Fund loan monthly payments and total interest. Supports both fixed monthly p…
- [Interest Rate Calculator (2026)](https://www.toolkk.com/tools/interest-rate-calculator): Enter your principal, annual interest rate, and term to quickly calculate total interest and total balance using simple…
- [Break-even ROI Calculator](https://www.toolkk.com/tools/breakeven-roi-calculator): Enter profit margin, return rate, and other cost proportions to quickly calculate break-even ROI and ROAS for ad spendin…
- [Time Deposit Interest Calculator](https://www.toolkk.com/tools/fixed-deposit-rate-calculator): Enter the principal amount, term, and interest rate to quickly calculate the interest earned and total amount at maturit…
- [NPV (Net Present Value) Calculator](https://www.toolkk.com/tools/npv-calculator): Calculate Net Present Value (NPV) and determine project investment value.
- [Bank Card 3-Factor Verification](https://www.toolkk.com/tools/bankcard-three-factor-verify): Accurately verify the consistency of a user's name, bank card number, and ID number to ensure financial transaction secu…
- [Bank Card 4-Factor Verification](https://www.toolkk.com/tools/bankcard-four-factor-verify): Verify the cardholder's name, bank card number, ID number, and phone number. Ensure information authenticity for real-na…
- [Consumer Loan Calculator](https://www.toolkk.com/tools/consumer-loan-calculator): Enter the loan amount, interest rate, and term to quickly calculate monthly payments and total interest on consumer loan…
- [Sick Leave Pay Calculator](https://www.toolkk.com/tools/sick-pay-calculator): Quickly calculate your sick leave pay and payout percentage based on your years of service and monthly salary.
- [Resale Property Tax Calculator](https://www.toolkk.com/tools/used-property-transaction-tax-calculator): Accurately calculate deed tax, VAT, and personal income tax for resale property transactions. Quickly get an itemized ta…
- [Gross Margin Calculator](https://www.toolkk.com/tools/gross-profit-margin-calculator): Input revenue and costs to instantly calculate gross profit margin, gross profit amount, and cost ratio, helping you det…
- [Annualized Interest Rate Calculator](https://www.toolkk.com/tools/annual-interest-rate-calculator): Quickly calculate the annualized interest rate or APY by entering your principal, final amount, and time period.
- [Corporate Bank Account Location Lookup](https://www.toolkk.com/tools/corporate-account-location-query): Enter a corporate bank account number to instantly find its registered province and city. Supports account name for enha…
- [Loan Affordability Calculator](https://www.toolkk.com/tools/loan-affordability-calculator): Calculate your maximum loan amount and monthly payments based on your income and debts to help budget for a new home or…
- [Monthly Interest Rate Calculator (2026)](https://www.toolkk.com/tools/monthly-interest-rate-calculator): Input principal, annual interest rate, and number of periods to quickly get monthly interest rate, monthly interest, and…
- [Stock Trading Calculator](https://www.toolkk.com/tools/stock-buy-sell-calculator): A practical tool to calculate stock trading profits, losses, ROI, and transaction fees.
- [Interest Rate Converter](https://www.toolkk.com/tools/interest-rate-converter): Quickly convert between annual interest rates, monthly interest rates, and daily interest rates. Supports both simple in…
- [Bulk Bank Card 3-Element Verification](https://www.toolkk.com/tools/bankcard-three-factor-batch-verify): Bulk verify user identities using name, bank card number, and ID number.
- [Daily Interest Rate Calculator (2026)](https://www.toolkk.com/tools/daily-interest-rate-calculator): Input annual or monthly interest rate to quickly calculate daily interest rate, daily interest, and total interest.
- [Annuity Present Value Calculator](https://www.toolkk.com/tools/annuity-present-value-calculator): Quickly calculate the present value and future value of ordinary annuities, annuities due, and perpetuities, with synchr…
- [Stock P/E Ratio Calculator](https://www.toolkk.com/tools/pe-ratio-calculator): Calculate stock P/E ratios online to quickly evaluate stock valuations and determine if shares are overvalued or underva…
- [Bulk Bank Card 4-Factor Verification](https://www.toolkk.com/tools/bankcard-four-factor-batch-verify): Bulk verify if the name, bank card number, ID number, and registered phone number match.
- [Simple Interest Calculator](https://www.toolkk.com/tools/simple-interest-calculator): Enter your principal, interest rate, and time period to quickly calculate simple interest and the total amount.
- [Rental Yield Calculator](https://www.toolkk.com/tools/rental-yield-calculator): Quickly calculate real estate rental yield and evaluate property investment value.
- [Historical K-Line Lookup](https://www.toolkk.com/tools/historical-kline): Query historical candlestick data from major global markets (open, high, low, close, volume) across stocks, forex, futur…
- [A-Share Adjusted K-Line Query](https://www.toolkk.com/tools/a-shares-kline-restoration): Enter a stock code to query forward-adjusted, backward-adjusted, or unadjusted historical K-line data for China A-shares…
- [China Precious Metal Price Calculator](https://www.toolkk.com/tools/precious-metal-price): Calculate the value of gold, silver, platinum, and palladium based on real-time quotes from Chinese exchanges. Enter the…
- [A-Share Candlestick Chart](https://www.toolkk.com/tools/a-shares-kline): Free online tool to query daily, weekly, and monthly candlestick charts for China A-shares. View price changes, trading…
- [Invoice Verification](https://www.toolkk.com/tools/invoice-verification): Verify VAT invoice authenticity. Enter the invoice code, number, and key details to instantly get validation results.
- [New Mutual Fund Screener](https://www.toolkk.com/tools/fund-new-list): Free online new mutual fund screener. Quickly filter currently available new funds, compare subscription fees, check fun…
- [Bulk Corporate Bank Account Location Lookup](https://www.toolkk.com/tools/corporate-account-location-batch-query): Bulk lookup branch locations for corporate bank accounts. Ideal for financial risk control and business audits.
- [Mutual Fund Data Lookup](https://www.toolkk.com/tools/fund-info-query): Enter a mutual fund ticker symbol to instantly check its net asset value (NAV), fund category, manager, and other essent…
- [UnionPay Card Account Type Checker](https://www.toolkk.com/tools/bankcard-account-type): Free online UnionPay card checker. Instantly identify card types (debit, credit, prepaid) using the first 6-digit BIN. F…
- [Fund Historical NAV Lookup](https://www.toolkk.com/tools/fund-nav-history): Free online tool to look up historical mutual fund NAVs and instantly calculate period returns. Track your investment pe…
- [On-Sale Fund List Lookup](https://www.toolkk.com/tools/fund-sale-list): Quickly search open-end mutual funds currently available on the market with multi-dimensional filtering to assist your i…
- [A-Shares Gainers and Losers Ranking](https://www.toolkk.com/tools/a-shares-ranking): Calculate the price change percentage of China A-shares over a specified period and view the top gainers and losers rank…
- [International Bank Card BIN Checker](https://www.toolkk.com/tools/bankcard-bin-query-intl): Free online international bank card BIN checker. Instantly look up a BIN/IIN to identify the card network, issuing count…
- [Fund Manager Lookup](https://www.toolkk.com/tools/fund-manager-query): Search for mutual fund managers by name to check historical performance. Quickly calculate annualized returns and ROI fo…
- [Mutual Fund Announcements Lookup](https://www.toolkk.com/tools/fund-notice-query): Enter a mutual fund ticker or name to quickly search and interpret official announcements, reports, and dividends releas…
- [Mutual Fund Holdings Lookup](https://www.toolkk.com/tools/fund-hold-query): Enter a mutual fund ticker to check its top 10 holdings and sector allocation. Analyze fund investment styles and concen…
- [US Stock Gainers & Losers Tracker](https://www.toolkk.com/tools/us-shares-ranking): Track real-time US stock market gainers, losers, and volume rankings. Use custom filters and sorting to analyze market t…
- [China A-Shares Real-Time Stock Quotes](https://www.toolkk.com/tools/a-shares-price): Enter a stock ticker to instantly get real-time China A-share prices, price changes, P/E ratios, and other key market da…
- [Mortgage Calculator](https://www.toolkk.com/tools/mortgage-calculator): Calculate monthly payments, total interest, and amortization schedules for conventional, provident fund, or combination…
- [Bulk Bank Card BIN Lookup (International)](https://www.toolkk.com/tools/bankcard-bin-batch-query-intl): Bulk lookup international bank card BINs to identify card networks, issuing banks, and countries of origin.
- [IRR (Internal Rate of Return) Calculator](https://www.toolkk.com/tools/irr-calculator): Calculate internal rate of return (IRR) and payback period to assess project returns and break-even timeline.
- [Forex Candlestick Chart Viewer](https://www.toolkk.com/tools/forex-kline): Enter a currency pair and timeframe to view forex candlestick charts and automatically calculate key indicators like pri…
- [Futures Candlestick Chart Query](https://www.toolkk.com/tools/futures-kline): Query futures candlestick data and automatically calculate the Simple Moving Average (SMA) to assist with trend analysis…
- [China Precious Metals Candlestick Charts](https://www.toolkk.com/tools/precious-metal-kline): View historical candlestick charts for Chinese precious metals like gold and silver. Analyze market trends and calculate…
- [Fund Return Ranking Lookup](https://www.toolkk.com/tools/fund-rank-query): Quickly search historical fund returns rankings and compare peer performance.
- [Fund Manager History Lookup](https://www.toolkk.com/tools/fund-manager-history): Enter a mutual fund code or name to instantly look up its past and present fund managers, their tenure dates, and histor…
- [Mutual Fund AUM Tracker](https://www.toolkk.com/tools/fund-asset-query): Enter a mutual fund ticker to quickly track historical AUM and fund size changes to make informed investment decisions.
- [Mutual Fund Trend Comparison](https://www.toolkk.com/tools/fund-yield-query): Compare historical net asset value (NAV) trends of multiple mutual funds on one screen to help evaluate performance diff…
- [Fund Dividend & Distribution Lookup](https://www.toolkk.com/tools/fund-bonus-query): Enter a fund code to view historical dividend distribution records, including dividend amount per share and ex-dividend…
- [Fund Fee Lookup](https://www.toolkk.com/tools/fund-rate-query): Enter a fund code or name to quickly query all fee details including management fees, custody fees, and subscription/red…
- [US Stock Candlestick Chart](https://www.toolkk.com/tools/us-shares-kline): Free online US stock candlestick chart tool. Enter a ticker to view daily charts, overlay moving averages, and identify…
- [Hong Kong Stock Gainers & Losers Ranking](https://www.toolkk.com/tools/hk-shares-ranking): Real-time Hong Kong stock quotes with gainers and losers rankings, analyze market activity and unusual price movements.
- [US Stock Real-Time Quotes](https://www.toolkk.com/tools/us-shares-price): Check real-time US stock prices, percentage changes, and P/E ratios instantly to monitor market trends.
- [HK Stock Candlestick Chart](https://www.toolkk.com/tools/hk-stocks-kline): View free real-time Hong Kong stock candlestick charts online. Quickly identify price patterns and trend signals for HKE…
- [Live Forex Quotes](https://www.toolkk.com/tools/forex-price): Check real-time exchange rates for major currency pairs. Quickly calculate currency conversions to make informed cross-b…
- [Global Futures Candlestick (K-Line) Lookup](https://www.toolkk.com/tools/external-futures-kline): Query candlestick data for global futures contracts to support technical analysis and trend forecasting.
- [Domestic Futures Real-Time Quote Lookup](https://www.toolkk.com/tools/internal-futures-price): Based on the cost-of-carry model, calculate the theoretical price of domestic futures contracts to help discover arbitra…
- [US Stock Ticker Lookup](https://www.toolkk.com/tools/us-shares-symbol): Enter a company name or fuzzy keyword to quickly look up US stock tickers, exchanges, and industry classifications.
- [Precious Metals Candlestick Chart](https://www.toolkk.com/tools/intl-precious-metal-kline): View live candlestick charts for gold, silver, and other precious metals. Track real-time prices and analyze market tren…
- [Domestic Futures Contract Lookup](https://www.toolkk.com/tools/internal-futures-contract): Query domestic futures contract specifications, assist in calculating margin and profit/loss, assist in trading decision…
- [Global Futures Quotes & Calculator](https://www.toolkk.com/tools/external-futures-price): Free online global futures quotes and P&L calculator. Get real-time price references and calculate profit and loss to ma…
- [Global Futures Contract Lookup](https://www.toolkk.com/tools/external-futures-contract): Quickly look up core specifications for futures contracts on CME, ICE, and other exchanges, including trading units, tic…
- [Hong Kong Stock Real-Time Quotes](https://www.toolkk.com/tools/hk-shares-price): Check real-time Hong Kong stock quotes and calculate your investment returns based on buy/sell prices and exchange rates…
- [International Precious Metals Price Lookup](https://www.toolkk.com/tools/intl-precious-metal-price): Real-time query of international gold, silver, and other precious metal prices, quickly calculate market value by weight…
- [Chinese Precious Metals Contract Calculator](https://www.toolkk.com/tools/precious-metal-contract): Look up Chinese precious metal contract specs (SGE & SHFE) and calculate margin requirements, PnL, and ROI online.
- [Precious Metals Contract Lookup](https://www.toolkk.com/tools/intl-precious-metal-contract): Quickly look up precious metals contract specifications, including trading units, pricing formats, and margin requiremen…
- [Symbol Search](https://www.toolkk.com/tools/symbol-search): Search for trading symbols (contract codes) of global stocks, futures, forex, cryptocurrencies, and precious metals by n…
- [Technical Indicator Query](https://www.toolkk.com/tools/technical-indicator): Calculate technical indicators by asset and timeframe: MACD, RSI, Bollinger Bands, EMA/SMA moving averages, KDJ, CCI, AT…
- [复利计算器](https://www.toolkk.com/tools/compound-interest-calculator): 在线计算复利现值和终值，输入本金、利率、期限和复利频率，立即得出结果。
- [银行存款利息计算器](https://www.toolkk.com/tools/bank-deposit-interest-calculator): 在线计算银行存款利息，支持活期、定期、通知存款，输入本金、利率和期限，立刻算出利息和本息合计。
- [利率变动还款计算器](https://www.toolkk.com/tools/interest-rate-change-repayment-calculator): 利率调整后，月供和利息会变多少？输入原贷款信息和新利率，快速对比等额本息/等额本金还款变化。

## Health (41)

> Online assessment and calculation of BMI, BFR, BMR, fetus, menstrual cycle, pregnancy and health index

- [Child Height Predictor Calculator](https://www.toolkk.com/tools/child-height-calculator): Enter the parents' heights and the child's gender to predict the child's adult height range based on classic genetic for…
- [Creatinine Clearance Calculator](https://www.toolkk.com/tools/ccr-calculator): Enter your age, weight, and serum creatinine to quickly assess your kidney function.
- [Fetal Weight Calculator](https://www.toolkk.com/tools/fetus-weight-calculator): Quickly estimate fetal weight using ultrasound data like Biparietal Diameter (BPD), Abdominal Circumference (AC), and Fe…
- [BMR Calculator (Basal Metabolic Rate)](https://www.toolkk.com/tools/bmr-calculator): Calculate the minimum daily calories your body needs at rest based on gender, height, weight, and age. Get a scientific…
- [Body Fat Calculator](https://www.toolkk.com/tools/bfr-calculator): Calculate your body fat percentage using BMI and waist circumference formulas. Get instant body composition insights for…
- [BMI Calculator](https://www.toolkk.com/tools/bmi-calculator): Calculate your Body Mass Index (BMI) and assess your health status based on height and weight. Ideal for personal health…
- [Body Surface Area (BSA) Calculator](https://www.toolkk.com/tools/bsa-calculator): Calculate Body Surface Area (BSA) based on height and weight using multiple medical formulas. Ideal for medication dosag…
- [Waist-to-Hip Ratio Calculator](https://www.toolkk.com/tools/whr-calculator): Calculate your Waist-to-Hip Ratio (WHR) online to assess central obesity risks and monitor your physical health.
- [P/F Ratio Calculator](https://www.toolkk.com/tools/pf-calculator): Calculate the P/F ratio using PaO2 and FiO2 to assess ARDS risk and pulmonary oxygenation function.
- [Baby Blood Type Calculator](https://www.toolkk.com/tools/child-blood-calculator): Calculate your baby's possible blood types and genetic probabilities based on the parents' ABO and Rh factors.
- [Blood Pressure Calculator](https://www.toolkk.com/tools/blood-pressure-calculator): A professional tool for assessing adult and pediatric blood pressure status, providing category references based on age,…
- [Pregnancy Due Date Calculator](https://www.toolkk.com/tools/baby-due-date-calculator): Quickly calculate your baby's due date, pregnancy duration, and lunar dates based on your LMP and menstrual cycle to hel…
- [Pediatric Dosage Calculator](https://www.toolkk.com/tools/child-dosage-calculator): Calculates reference medication doses based on adult dosage and child's age. Supports common units like ml and grams to…
- [Target Heart Rate Calculator](https://www.toolkk.com/tools/thr-calculator): Calculate your personalized target heart rate zone based on age, resting heart rate, and fitness level to scientifically…
- [Jaundice Index Calculator](https://www.toolkk.com/tools/jaundice-index-calculator): Enter your bilirubin levels and select if it's for a newborn to quickly assess the jaundice index and normal ranges. Ide…
- [Waist-to-Height Ratio (WHtR) Calculator](https://www.toolkk.com/tools/whtr-calculator): Calculate your Waist-to-Height Ratio (WHtR) to assess central obesity risks and get actionable health advice.
- [Blood Glucose Unit Converter](https://www.toolkk.com/tools/blood-sugar-converter): A professional blood sugar calculator for diabetics and healthcare providers to quickly convert between mmol/L and mg/dL…
- [Insulin Dose Calculator](https://www.toolkk.com/tools/insulin-dosage-calculator): Calculate your bolus insulin dose based on target blood sugar and carbohydrate intake to assist with precise diabetes ma…
- [Nutritional Risk Index (NRI) Calculator](https://www.toolkk.com/tools/nri-calculator): Enter serum albumin, current weight, and usual weight to quickly calculate your NRI score, assess nutritional status, an…
- [Next Blood Donation Calculator](https://www.toolkk.com/tools/blood-donation-calculator): Automatically calculate your next eligible blood donation date based on your previous donation type and date to help you…
- [Daily Water Intake Calculator](https://www.toolkk.com/tools/drink-water-calculator): Calculate your personalized daily water intake based on weight and activity duration. Get scientific hydration recommend…
- [Maximum Heart Rate (MHR) Calculator](https://www.toolkk.com/tools/mhr-calculator): Calculate your maximum heart rate using multiple scientific formulas to help fitness enthusiasts create effective traini…
- [Fetal CPR Calculator](https://www.toolkk.com/tools/fetus-cpr-index-calculator): Enter the fetal MCA PI and UA PI values to instantly calculate the cerebroplacental ratio (CPR) and help assess the risk…
- [ICH Volume Calculator](https://www.toolkk.com/tools/ich-calculator): A fast intracerebral hemorrhage volume estimation tool based on the ABC/2 formula to assist clinical decision-making.
- [Thyroid Metabolic Rate Calculator](https://www.toolkk.com/tools/thyroid-bmr-calculator): Estimate your thyroid basal metabolic rate (BMR) using pulse rate and pulse pressure to preliminarily assess hyperthyroi…
- [Breath Calculator](https://www.toolkk.com/tools/breath-count-calculator): Enter your date of birth and breathing rate to estimate your total lifetime breaths, along with the total days and minut…
- [Coronary Heart Disease Risk Calculator](https://www.toolkk.com/tools/cad-index-calculator): Calculate your coronary heart disease risk index and assess cardiovascular health based on age, blood pressure, and chol…
- [Respiratory Index (RI) Calculator](https://www.toolkk.com/tools/ri-calculator): A fast Respiratory Index (RI) calculation tool for medical professionals to assess lung oxygenation function.
- [Thyroid Nodule Grading Interpreter](https://www.toolkk.com/tools/thyroid-tumor-grading-inquiry): Interpret thyroid nodule TI-RADS grades and assess malignancy risk based on standard guidelines.
- [Follicle Size Calculator](https://www.toolkk.com/tools/follicle-diameter-calculator): Enter your ultrasound follicle measurements to instantly assess development and optimize your chances of conceiving.
- [GFR Calculator](https://www.toolkk.com/tools/gfr-calculator): Quickly calculate Glomerular Filtration Rate (GFR) based on the CKD-EPI formula to assess kidney health.
- [Thyroid Nodule Aspect Ratio Calculator](https://www.toolkk.com/tools/thyroid-nodule-aspect-ratio-calculator): Enter the AP and transverse diameters of a thyroid nodule to calculate its aspect ratio, assess malignancy risk, and hel…
- [Fetal Weight Chart by Gestational Age](https://www.toolkk.com/tools/fetal-weight-reference): A fetal weight reference tool based on NICHD Asian singleton data, helping expectant parents quickly assess their baby's…
- [Gestational Age Calculator](https://www.toolkk.com/tools/gestational-age-calculator): Accurately calculate fetal gestational age using your Last Menstrual Period (LMP) or ultrasound measurements (CRL, BPD,…
- [Ovulation Calculator](https://www.toolkk.com/tools/ovulation-calculator): Automatically calculate your ovulation day and fertile window based on your menstrual cycle to help you find the best ti…
- [Fetal Growth Chart](https://www.toolkk.com/tools/fetal-growth-reference): A fetal development reference tool based on authoritative consensus, providing standard ranges for key parameters like B…
- [Fetal Gestational Age Chart](https://www.toolkk.com/tools/gestational-age-reference): Quickly check fetal gestational age using ultrasound measurements like Crown-Rump Length (CRL) and Head Circumference (H…
- [Child Vaccination Schedule](https://www.toolkk.com/tools/children-vaccination-schedule): Generate a personalized 0-6 year child vaccination schedule by birth date. Easily track your baby's immunization plan an…
- [Progesterone Normal Range Checker](https://www.toolkk.com/tools/progesterone-reference): Check normal progesterone levels by pregnancy week and get a standard reference chart.
- [TDEE Calculator](https://www.toolkk.com/tools/tdee-calculator): Calculate your Total Daily Energy Expenditure (TDEE) based on the Mifflin-St Jeor equation to get scientific calorie rec…
- [糖尿病饮食计算器](https://www.toolkk.com/tools/diabetes-diet-calculator): 根据个人情况计算每日所需热量及三大营养素分配，辅助糖尿病饮食管理。

## Network (74)

> Provides online query and detection tools such as webmaster SEO, IP domain name, DNS query, and vulnerability detection.

- [Random User Agent Generator](https://www.toolkk.com/tools/random-useragent-generator): Generate random browser User-Agent strings for developers, QA testers, and web scrapers to simulate various devices and…
- [IPv4 / IPv6 Address Converter](https://www.toolkk.com/tools/ipv4-ipv6-converter): A two-way IPv4 and IPv6 address converter for network configuration, debugging, and format validation.
- [Download Link Converter](https://www.toolkk.com/tools/download-link-converter): Convert HTTP/HTTPS file URLs into dedicated download links for Thunder, FlashGet, and QQ Xuanfeng to use with various do…
- [Random MAC Address Generator](https://www.toolkk.com/tools/random-mac-generator): Bulk generate random MAC addresses online with uppercase or lowercase formatting. Ideal for network testing and developm…
- [MAC Address Vendor Lookup](https://www.toolkk.com/tools/mac-manufacturer-query): Enter a MAC address to instantly identify the device manufacturer and detailed physical address. Perfect for network man…
- [Random IP Address Generator](https://www.toolkk.com/tools/random-ip-generator): Generate IPv4 and IPv6 addresses on demand. Supports specific public/private networks and custom CIDR ranges. Ideal for…
- [Online DIG Lookup](https://www.toolkk.com/tools/dig-query): Professional tool to query domain DNS records. Supports A, AAAA, MX, NS, and custom DNS servers.
- [Ad CPM Calculator](https://www.toolkk.com/tools/ad-cpm-calculator): Enter your ad spend and impressions to instantly calculate your cost per thousand impressions (CPM) and optimize your bu…
- [IP to Number Converter](https://www.toolkk.com/tools/ip-number-converter): Convert IP addresses to decimal integers and vice versa. Supports both IPv4 and IPv6 formats. Ideal for development, deb…
- [WiFi QR Code Generator](https://www.toolkk.com/tools/wifi-qrcode-generator): Enter your WiFi name and password to instantly generate a scan-to-connect QR code. Eliminate the hassle of typing long p…
- [IP Address Extractor](https://www.toolkk.com/tools/ip-extractor): Batch extract valid IPv4 addresses from logs, code, or any text. Includes built-in counting statistics.
- [Website WAF Checker](https://www.toolkk.com/tools/website-waf-detect): Quickly identify if a website has a Web Application Firewall (WAF) deployed, detect its type and vendor, and get reliabl…
- [Bulk MAC Vendor Lookup](https://www.toolkk.com/tools/mac-manufacturer-batch-query): Bulk lookup Apple device manufacturers, models, and production details via MAC address. Ideal for IT management and devi…
- [IPv6 Address Compressor](https://www.toolkk.com/tools/ipv6-compress): Compress IPv6 addresses to their shortest RFC-compliant format by removing redundant zeros. Perfect for network configur…
- [Online NSLookup Tool](https://www.toolkk.com/tools/nslookup-query): Check domain DNS records online. Instantly look up A, AAAA, CNAME, MX, and NS records with support for custom DNS server…
- [CDN Provider Checker](https://www.toolkk.com/tools/cdn-provider-detect): Quickly identify the CDN provider used by any domain to optimize website performance and security.
- [WHOIS Domain Lookup](https://www.toolkk.com/tools/whois-query): Look up domain WHOIS registration information via command line to retrieve key data like the owner, registrar, and expir…
- [China Mobile DNS Server IP Database](https://www.toolkk.com/tools/cmcc-public-dns-ip-database): Provides China Mobile public DNS server IP addresses and location information, covering all provinces, municipalities, a…
- [WPA Key Generator](https://www.toolkk.com/tools/wpa-key-generator): Generate WPA/WPA2 compliant wireless passwords. Customize length and format to enhance your WiFi security.
- [TCP/UDP Port Lookup](https://www.toolkk.com/tools/tcp-udp-port-query): Look up service names and descriptions for TCP/UDP port numbers. Covers IANA standard ports for network management, deve…
- [Subdomain Scanner Tool](https://www.toolkk.com/tools/subdomain-detect): Quickly scan and find all active subdomains for a target domain. Generate a standardized list for security assessments a…
- [Bulk URL Opener](https://www.toolkk.com/tools/open-urls-bulk): Paste a multi-line list of URLs, and the tool will automatically open them one by one in new tabs at your set interval.…
- [HTTP Status Code Lookup](https://www.toolkk.com/tools/http-status-code-query): Provides developers and DevOps with complete definitions, category explanations, and RFC specification sources for HTTP…
- [AdSense Revenue Calculator](https://www.toolkk.com/tools/google-adsense-income-calculator): Enter page impressions, CTR, and CPC to instantly calculate your estimated AdSense revenue, total clicks, and eCPM.
- [User Agent String Parser](https://www.toolkk.com/tools/useragent-parser): Parse User-Agent strings from HTTP request headers to extract detailed technical information, including browser, operati…
- [User-Agent String Lookup](https://www.toolkk.com/tools/common-useragent-query): Access a comprehensive list of User-Agent strings for major browsers and operating systems. Features one-click copying f…
- [MIME Type Reference Table](https://www.toolkk.com/tools/common-mime-types): A quick reference tool for MIME types and file extensions used in web development.
- [Page Value Calculator](https://www.toolkk.com/tools/page-value-calculator): Enter website revenue and pageviews to quickly calculate the contribution value of a single page.
- [GZIP Compression Checker](https://www.toolkk.com/tools/webpage-gzip-compress-detect): Enter a webpage URL to instantly check if GZIP compression is enabled. Estimate compression ratios and file size savings…
- [TLS LOGJAM Vulnerability Scanner](https://www.toolkk.com/tools/tls-logjam-cve-detect): Scan your website's TLS configuration for the LOGJAM vulnerability and evaluate the security of your Diffie-Hellman key…
- [WEP Key Generator](https://www.toolkk.com/tools/wep-key-generator): Generate 64-bit or 128-bit WEP keys in HEX or ASCII formats. Supports batch generation. Ideal for connecting legacy devi…
- [Sitemap XML URL Extractor](https://www.toolkk.com/tools/sitemap-url-extractor): Extract URL lists from Sitemap XML code for SEO analysis, web scraping, or content auditing.
- [HTTP Request Methods Cheat Sheet](https://www.toolkk.com/tools/http-request-method-query): Look up the definitions, semantics, idempotency, and safety of HTTP request methods to assist with web development and A…
- [China Telecom Public DNS IP Lookup](https://www.toolkk.com/tools/ctcc-public-dns-ip-database): Get China Telecom's public DNS server IP addresses to optimize network resolution speed with coverage across all provinc…
- [CPC Calculator](https://www.toolkk.com/tools/ad-cpc-calculator): Enter your CPM and CTR to instantly calculate your Cost Per Click (CPC) and optimize your ad budget.
- [Brotli Compression Checker](https://www.toolkk.com/tools/webpage-brotli-compress-detect): Check if a specific URL's HTTP response has Brotli compression enabled to analyze compression performance and optimize w…
- [GitHub Download Accelerator](https://www.toolkk.com/tools/github-proxy-speed): Fix slow GitHub downloads for files, repositories, and releases with our stable, high-speed download channel.
- [Visitor Value Calculator](https://www.toolkk.com/tools/visiter-value-calculator): Enter your website revenue and traffic to calculate the average visitor value in one click. Use it to evaluate marketing…
- [Website Shortcut Generator](https://www.toolkk.com/tools/webpage-shortcut-generator): Enter a URL and name to generate a desktop shortcut file for Windows.
- [HTML Meta Tag Generator](https://www.toolkk.com/tools/webpage-meta-generator): Helps webmasters quickly generate SEO-compliant HTML meta tags to improve search engine visibility.
- [SSL Heartbleed Vulnerability Scanner](https://www.toolkk.com/tools/ssl-heartbleed-cve-detect): Online scanner to check websites or servers for the CVE-2014-0160 (Heartbleed) vulnerability and assess SSL/TLS security…
- [SSL FREAK Vulnerability Checker](https://www.toolkk.com/tools/ssl-freak-cve-detect): Scan a specified domain for the SSL FREAK vulnerability (CVE-2015-0204) and assess TLS/SSL security configuration risks.
- [TLS Ticketbleed Vulnerability Scanner](https://www.toolkk.com/tools/tls-ticketbleed-cve-detect): Scan websites or servers for the TLS Ticketbleed vulnerability (CVE-2016-9244) to assess the risk of memory information…
- [Web Screenshot Tool](https://www.toolkk.com/tools/webpage-screenshot): Enter a URL to generate high-quality web screenshots, supporting PNG/JPG format downloads
- [SSL CCS Injection Vulnerability Scanner](https://www.toolkk.com/tools/ssl-ccs-injection-cve-detect): Scan target servers for the CVE-2014-0224 vulnerability, assess SSL communication security, and generate a CVE/CWE risk…
- [CERNET Public DNS IP Database](https://www.toolkk.com/tools/cen-public-dns-ip-database): Lookup CERNET public DNS server IP addresses and locations to optimize domain resolution speed for education network use…
- [CIDR Subnet Calculator](https://www.toolkk.com/tools/cidr-calculator): Calculate subnet masks, network addresses, broadcast addresses, and usable host ranges from CIDR IP addresses. Ideal for…
- [IPv6 Location Lookup](https://www.toolkk.com/tools/ipv6-location-lookup): Accurately find the geolocation of any IPv6 address, including country, city, and ISP details.
- [Port Checker](https://www.toolkk.com/tools/port-check): Quickly check the open port status of an IP or domain for network diagnostics and security validation.
- [IP Geolocation Lookup Tool](https://www.toolkk.com/tools/ip-address-location-query): Provides real-time IP geolocation lookup services, returning detailed information such as country, state, city, and ISP.
- [URL Extractor](https://www.toolkk.com/tools/url-extractor): Parse and extract valid URLs from text or HTML source code with support for multiple protocols.
- [China Unicom DNS Server IP Database](https://www.toolkk.com/tools/cucc-public-dns-ip-database): Query China Unicom DNS servers across provinces and cities, view public DNS server IPs and location info, optimize netwo…
- [IPv6 Test Tool](https://www.toolkk.com/tools/ipv6-test): Check IPv6 support for your network or website and get detailed connectivity and DNS resolution diagnostic reports.
- [Global Public DNS Servers List](https://www.toolkk.com/tools/global-public-dns-ip-database): Search global public DNS server IP addresses and location information to help optimize network connection speed and secu…
- [2FA Code Generator & Validator](https://www.toolkk.com/tools/two-factor-generator): Generate and verify two-factor authentication (2FA) codes online to secure your accounts.
- [Bank Card Number Extractor](https://www.toolkk.com/tools/bankcard-extractor): Automatically identify and extract all bank card numbers (16–19 digits) from text, with support for deduplication and oc…
- [TTFB Test Tool](https://www.toolkk.com/tools/ttfb-test): Measure your server's Time to First Byte (TTFB) to help developers optimize website performance and SEO rankings.
- [China Railcom Public DNS Server List](https://www.toolkk.com/tools/ctt-public-dns-ip-database): Look up China Railcom DNS server IP addresses by province and city to optimize your network resolution speed.
- [Ping Test](https://www.toolkk.com/tools/ping-test): Ping test tool to check network connectivity, latency, and packet loss for quick network troubleshooting.
- [License Plate Extractor](https://www.toolkk.com/tools/carplate-extractor): Use AI to recognize license plate numbers and origins from images. Supports multiple plate types and input formats.
- [Bulk IP Geolocation Lookup](https://www.toolkk.com/tools/ip-address-location-batch-query): Bulk lookup IP address locations and network details with city-level accuracy.
- [HSTS Checker](https://www.toolkk.com/tools/hsts-test): Check your website's HSTS configuration status, analyze security header parameters, and enhance HTTPS strict transport s…
- [Short URL Generator](https://www.toolkk.com/tools/short-url-generator): Convert long URLs into long-term valid short links with customizable short code length, perfect for sharing, bookmarking…
- [Street-Level IP Address Geolocation Tool](https://www.toolkk.com/tools/ip-address-location-street-query): Accurately look up the street-level location and ISP details of an IP address. Supports both IPv4 and IPv6 parsing.
- [SSL Certificate Checker](https://www.toolkk.com/tools/ssl-check): Free online SSL certificate checker. Verify website SSL validity, view issuer details, and check expiration dates instan…
- [Reverse IP Lookup](https://www.toolkk.com/tools/reverse-ip-lookup): Free reverse IP lookup tool to find all domains hosted on a single IP address. Check DNS resolution history for IPv4 and…
- [Domain Checker](https://www.toolkk.com/tools/domain-check): Check domain DNS records and HTTP status codes online to quickly diagnose website connectivity and network issues.
- [Baidu Spider IP Checker](https://www.toolkk.com/tools/baidu-spider-detect): Verify if a visiting IP address belongs to a genuine Baidu Spider. Easily identify fake crawlers and validate bot identi…
- [ID Card Face Match Verification](https://www.toolkk.com/tools/idcard-face-validate): Verify if an ID card photo and a real-life photo belong to the same person using AI facial recognition technology.
- [Date Extractor](https://www.toolkk.com/tools/date-extractor): Intelligently recognize and extract various date and time information from text with standardized output.
- [IP Risk Profile Checker](https://www.toolkk.com/tools/ip-portrait-query): Check the security risk profile of an IP address, including key threat intelligence like threat types, reputation scores…
- [GitHub Hosts Finder](https://www.toolkk.com/tools/github-hosts-query): Get the latest and fastest GitHub IP addresses in real-time to fix slow access caused by DNS spoofing.
- [Steam Hosts Lookup](https://www.toolkk.com/tools/steam-hosts-query): Resolve Steam Community and Store access issues. Smartly look up optimal IP addresses and optimize your local hosts conf…
- [HTTP Header Checker](https://www.toolkk.com/tools/http-headers-checker): Online tool to parse HTTP request and response headers for websites or APIs, helping developers debug and optimize netwo…

## Math (124)

> Supports unit conversion of length, area, temperature, pressure, etc., and calculation of mathematical formulas such as area and volume.

- [Inverse Trigonometric Function Calculator](https://www.toolkk.com/tools/anti-trigonometric-calculator): Accurately calculate radian values for inverse trig functions like arcsin and arccos. Supports 6 function types and cust…
- [Trigonometry Calculator](https://www.toolkk.com/tools/trigonometry-calculator): Calculate six trigonometric functions from radian values with custom decimal precision.
- [Prime and Composite Number Calculator](https://www.toolkk.com/tools/prime-composite-calculator): Instantly identify prime, composite, or special numbers. Supports batch checking and mathematical property analysis.
- [Circle Area Calculator](https://www.toolkk.com/tools/circle-area-calculator): Quickly calculate the area of a circle by entering the radius, diameter, or circumference. Supports custom units and pre…
- [Least Common Multiple (LCM) Calculator](https://www.toolkk.com/tools/lcm-calculator): Quickly calculate the least common multiple (LCM) of two or more integers. Supports space-separated number list input.
- [Greatest Common Divisor (GCD) Calculator](https://www.toolkk.com/tools/gcd-calculator): An online tool to calculate the greatest common divisor (GCD) of multiple integers. Supports space-separated number list…
- [Cube Root Calculator](https://www.toolkk.com/tools/cbrt-calculator): Quickly calculate the cube root of any number with customizable decimal places for accurate and reliable results.
- [Arithmetic Sequence Generator](https://www.toolkk.com/tools/arithmetic-progression-generator): Generate standard arithmetic sequences using the first term, common difference, and number of terms. Ideal for math stud…
- [压力单位换算](https://www.toolkk.com/tools/pressure-unit-converter): 支持帕斯卡(Pa)、psi、bar、atm等14种压力单位间的精确换算，适用于工程、气象及科研领域。
- [Logarithm Calculator](https://www.toolkk.com/tools/logarithm-calculator): Quickly calculate natural, binary, and common logarithms with custom precision. Perfect for math students and scientific…
- [Trapezoid Area Calculator](https://www.toolkk.com/tools/trapezoid-area-calculator): Quickly calculate the area of a trapezoid by entering the top base, bottom base, and height. Supports custom units and p…
- [Temperature Unit Converter](https://www.toolkk.com/tools/temperature-unit-converter): Convert between 5 temperature units online, including Celsius, Fahrenheit, and Kelvin. Supports custom decimal precision…
- [Geometric Sequence Generator](https://www.toolkk.com/tools/geometric-progression-generator): Automatically calculate and generate a complete geometric sequence based on the first term, common ratio, and number of…
- [Sector Area Calculator](https://www.toolkk.com/tools/sector-area-calculator): Quickly calculate the area of a sector based on the radius and central angle (degrees or radians), with support for cust…
- [Weight Unit Converter](https://www.toolkk.com/tools/weight-unit-converter): Accurately convert between 20+ weight and mass units including kilograms, pounds, ounces, and carats. Perfect for cookin…
- [Factorial Calculator](https://www.toolkk.com/tools/factorial-calculator): Calculate the factorial (n!) of any positive integer. Ideal for math, programming, and statistics.
- [Ellipse Area Calculator](https://www.toolkk.com/tools/ellipse-area-calculator): Accurately calculate the area of an ellipse by entering the semi-major and semi-minor axes. Supports customizable units…
- [Number Sequence Generator](https://www.toolkk.com/tools/consecutive-number-generator): Generate custom number sequences based on start value, end value, and step size. Ideal for programming, testing, and bul…
- [长度单位换算](https://www.toolkk.com/tools/length-unit-converter): 在线换算千米、米、英寸、英尺等长度单位，支持公制、英制及市制单位，结果可复制。
- [Antilog Calculator](https://www.toolkk.com/tools/antilogarithm-calculator): Calculate the antilogarithm of any value using base e, 2, or 10. Instantly restore the original number
- [Area Unit Converter](https://www.toolkk.com/tools/area-unit-converter): An accurate area conversion tool for square meters, hectares, acres, square feet, mu, and more.
- [力学单位转换](https://www.toolkk.com/tools/force-unit-converter): 在线转换牛顿、千克力、磅力等力学单位，适用于工程计算与物理学习。
- [Exponent Calculator](https://www.toolkk.com/tools/power-calculator): Calculate integer, decimal, or negative powers of any number. Supports scientific notation and is ideal for math and eng…
- [Volume Unit Converter](https://www.toolkk.com/tools/volume-unit-converter): Supports high-precision conversion of dozens of volume units including cubic meters, liters, and gallons. Ideal for engi…
- [Angle Unit Converter](https://www.toolkk.com/tools/angle-unit-converter): Accurately convert between 8 angle units including degrees, radians, minutes, seconds, and gradians. Ideal for engineeri…
- [Reaction Time Test](https://www.toolkk.com/tools/online-reaction-time-test): Measure your visual reaction time online. Run multiple tests to calculate an average and see where your reaction speed s…
- [存储单位转换器](https://www.toolkk.com/tools/storage-unit-converter): 提供比特(bit)、字节(B)到艾字节(EB)等数据存储单位的精确互转，支持自定义小数位数。
- [Parallelogram Area Calculator](https://www.toolkk.com/tools/parallelogram-area-calculator): Quickly calculate the area of a parallelogram by entering the base and height. Supports custom units and precision setti…
- [Equilateral Triangle Area Calculator](https://www.toolkk.com/tools/equilateral-triangle-area-calculator): Enter the side length or height to instantly calculate the area of an equilateral triangle. Highly accurate results, per…
- [热量单位换算器](https://www.toolkk.com/tools/heat-unit-converter): 在焦耳、卡路里、千瓦时等十余种能量单位间进行快速、精确的互转。
- [时间单位转换器](https://www.toolkk.com/tools/time-unit-converter): 提供年、周、天、时、分、秒、毫秒、微秒、纳秒之间的精确换算，支持自定义小数位数。
- [Density Unit Converter](https://www.toolkk.com/tools/density-unit-converter): A precise density unit converter for engineering, research, and education. Easily convert between various mass and volum…
- [Speed Unit Converter](https://www.toolkk.com/tools/speed-unit-converter): Accurately convert between speed units like mph, km/h, m/s, Mach, and the speed of light. Ideal for research, engineerin…
- [Power Unit Converter](https://www.toolkk.com/tools/power-unit-converter): Accurately convert between watts, kilowatts, horsepower, and other power units. Ideal for engineering, physics, and ever…
- [Phone Number Value Estimator](https://www.toolkk.com/tools/mobile-number-value-estimator): Based on digital patterns and beautiful number culture, get a fun reference valuation for your phone number and see how…
- [Percentage Calculator](https://www.toolkk.com/tools/percentage-calculator): Percentage calculator tool supporting common scenarios like percentage increase/decrease and discounts.
- [Voltage Divider Calculator](https://www.toolkk.com/tools/voltage-divider-calculator): Free online voltage divider calculator. Quickly calculate output voltage from input voltage and two resistor values. Ide…
- [Latitude & Longitude Coordinate Converter](https://www.toolkk.com/tools/latitude-longitude-converter): Fix map offset issues and easily convert between WGS84, GCJ02, and BD09 coordinate systems. Ideal for developers and geo…
- [Math Facts Generator](https://www.toolkk.com/tools/mental-math-generator): Automatically generate elementary math practice problems for addition, subtraction, multiplication, and division. Suppor…
- [Square Calculator](https://www.toolkk.com/tools/square-calculator): Calculate the square of any number, including integers, decimals, and negative numbers. Ideal for math learning and engi…
- [Average Calculator](https://www.toolkk.com/tools/average-calculator): Enter a set of numbers to quickly calculate the arithmetic mean, sum, and count.
- [Printable Multiplication Table](https://www.toolkk.com/tools/multiplication-table-query): Generate and download a free high-resolution 1-9 multiplication table chart for easy printing.
- [Nth Root Calculator](https://www.toolkk.com/tools/nth-root-calculator): Calculate the nth root of any real number. Supports integer and decimal exponents, perfect for students and engineering…
- [24 Game Calculator](https://www.toolkk.com/tools/point24-calculator): Quickly calculate how to make 24 from four numbers using basic math operations.
- [Online Stopwatch Timer](https://www.toolkk.com/tools/online-stopwatch-timer): Free online stopwatch timer with no download required. Features one-click start/stop, lap tracking, and easy time copyin…
- [T-Test Calculator](https://www.toolkk.com/tools/t-test-calculator): An online t-test calculator that quickly tells whether the difference between two group means is significant — enter the…
- [Fraction Calculator](https://www.toolkk.com/tools/fraction-calculator): Free online fraction calculator to quickly add, subtract, multiply, and divide fractions. Easily simplify fractions and…
- [Yu'e Bao Earnings Calculator](https://www.toolkk.com/tools/yuebao-return-calculator): Enter principal, annual yield rate, and days to quickly calculate expected returns for Alipay Yuebao
- [Chinese Zodiac Lookup](https://www.toolkk.com/tools/zodiac-query): Enter your Gregorian birth date or year to instantly discover your Chinese zodiac sign, heavenly stems & earthly branche…
- [Linear Interpolation Calculator](https://www.toolkk.com/tools/linear-interpolation-calculator): Quickly calculate the linear interpolation result of an intermediate point based on two known coordinates.
- [Chinese Gender Predictor Chart (2026)](https://www.toolkk.com/tools/male-female-predictor-2026): Predict your baby's gender in 2026 using the traditional Chinese Gender Chart. Simply enter the mother's lunar age and c…
- [Online Text Formatting Tool](https://www.toolkk.com/tools/online-text-layout-tool): Automatically handle first-line indents, clean up extra blank lines and spaces, and unify punctuation for clean, well-fo…
- [System of Linear Equations Calculator](https://www.toolkk.com/tools/linear-equation-calculator): Enter two linear equations to instantly solve for x and y. Free online calculator with step-by-step solutions.
- [Current Unit Converter](https://www.toolkk.com/tools/electric-unit-converter): Quickly and accurately convert current units like amps and milliamps.
- [Cube Calculator](https://www.toolkk.com/tools/cube-calculator): Calculate the 3rd power (cube) of any real number online. Ideal for math learning and engineering calculations.
- [PPI Calculator](https://www.toolkk.com/tools/ppi-calculator): Input display resolution and diagonal size to instantly calculate PPI, total pixels, and dot pitch.
- [Vertical Text Converter](https://www.toolkk.com/tools/vertical-text-vertical-classical-chinese-converter): Convert horizontal text into traditional vertical layout, great for calligraphy, classical Chinese, and poster design.
- [Water Density Calculator](https://www.toolkk.com/tools/water-density-calculator): Calculate water density instantly by entering temperature and salinity. Get accurate results in kg/m³ or g/cm³.
- [Greek Alphabet Reference](https://www.toolkk.com/tools/greek-alphabet): Quickly query 24 Greek letters with uppercase, lowercase, pronunciation, and common usage scenarios.
- [Scientific Notation Converter](https://www.toolkk.com/tools/scientific-notation-converter): Fast and free online scientific notation converter. Easily convert between scientific notation and standard numbers with…
- [Coefficient of Variation Calculator](https://www.toolkk.com/tools/coefficient-of-variation-calculator): Calculate the coefficient of variation (CV) from your dataset to easily assess relative dispersion and data volatility.…
- [Pythagorean Theorem Calculator](https://www.toolkk.com/tools/pythagorean-theorem-calculator): Enter any two sides of a right triangle to instantly calculate the length of the third side.
- [Difference of Squares Calculator](https://www.toolkk.com/tools/diff-squares-calculator): Enter two values, a and b, to automatically calculate the difference of squares (a+b)(a-b) and simplify your algebraic c…
- [Resistor, Capacitor & Inductor Unit Converter](https://www.toolkk.com/tools/resistance-unit-converter): Online unit conversion tool for resistors, capacitors, and inductors.
- [Weighted Average Calculator](https://www.toolkk.com/tools/weighted-average-calculator): Quickly calculate the weighted average by entering values and their corresponding weights. Supports unlimited data sets.
- [Prime Factorization Calculator](https://www.toolkk.com/tools/prime-factorization-calculator): Enter any positive integer to instantly calculate its prime factorization. Get prime number verification and detailed st…
- [Parabola Equation Solver](https://www.toolkk.com/tools/parabola-equation-solver): Input three point coordinates to quickly find the parabola's standard form, vertex coordinates, and axis of symmetry.
- [Addition Table Up to 10](https://www.toolkk.com/tools/addition-table-query): Provides an addition table up to 10 in image format, available for printable download.
- [Rectangular Prism (Cuboid) Calculator](https://www.toolkk.com/tools/rectangular-prism-calculator): Enter length, width, and height to instantly calculate the base area, lateral surface area, total surface area, volume,…
- [Root Mean Square (RMS) Calculator](https://www.toolkk.com/tools/rms-calculator): Quickly calculate the Root Mean Square (RMS) of a dataset online. Perfect for signal analysis, AC effective values, and…
- [Continued Fraction Calculator](https://www.toolkk.com/tools/continued-fraction-calculator): Free online continued fraction calculator. Expand any real number or fraction into a continued fraction, or convert a se…
- [Subtraction Chart Generator (Up to 10)](https://www.toolkk.com/tools/subtraction-table-query): Quickly generate a subtraction chart up to 10. Supports printing and PDF downloads.
- [Modulo Calculator](https://www.toolkk.com/tools/online-modulo-calculator): Calculate the remainder of two numbers after division. A free online modulo calculator supporting both positive and nega…
- [Complex Number Calculator](https://www.toolkk.com/tools/plural-calculator): Free online complex number calculator. Add, subtract, multiply, and divide two complex numbers instantly. Perfect for ci…
- [Point to Line Distance Calculator](https://www.toolkk.com/tools/distance-from-point-to-line-calculator): Free online point to line distance calculator. Quickly calculate the perpendicular distance from a point to a line using…
- [Speed of Sound Calculator](https://www.toolkk.com/tools/speed-of-sound-calculator): Quickly calculate the speed of sound propagation in air based on temperature, humidity, and air pressure; supports real-…
- [Normal Distribution Calculator](https://www.toolkk.com/tools/normal-distribution-calculator): Input mean and standard deviation to quickly calculate the cumulative probability or quantile corresponding to a value.
- [Cone Calculator](https://www.toolkk.com/tools/cone-calculator): Free online cone calculator to quickly find the volume, surface area, lateral surface area, and base area of a cone.
- [Snake Case & Camel Case Converter](https://www.toolkk.com/tools/underscore-camelcase-converter): Quickly convert between snake_case and camelCase naming, supports batch processing and common edge cases.
- [Fraction Simplifier](https://www.toolkk.com/tools/fraction-reduction-calculator): Free online fraction simplifier. Enter the numerator and denominator to instantly reduce fractions to their simplest for…
- [Perfect Square Expansion Calculator](https://www.toolkk.com/tools/perfect-square-calculator): Quickly expand (a±b)² algebraic expressions into standard polynomials. Ideal for math learning and verification.
- [Poisson Distribution Calculator](https://www.toolkk.com/tools/poisson-distribution-calculator): Enter the average rate (λ) and number of events (k) to quickly calculate the exact Poisson probability P(X=k) and cumula…
- [Curtain Fabric Calculator](https://www.toolkk.com/tools/curtain-calculator): Input window width, pleat multiplier, and fabric width to quickly calculate how many meters of fabric a single curtain n…
- [Perfect Cube Expansion Calculator](https://www.toolkk.com/tools/perfect-cube-calculator): Calculate the algebraic expansion of (a+b)³ and (a-b)³. Supports numbers and expressions, and automatically simplifies t…
- [Sliding Friction Calculator](https://www.toolkk.com/tools/online-sliding-friction-calculator): Quickly calculate sliding friction by entering the coefficient of friction and normal force. A free online kinetic frict…
- [Mass Flow Rate Calculator](https://www.toolkk.com/tools/online-mass-flow-rate-calculator): Free online mass flow rate calculator. Enter density and volumetric flow rate to quickly calculate mass flow rate with a…
- [Periodic Table Lookup](https://www.toolkk.com/tools/periodic-query): Quickly search the periodic table to get detailed element properties and chemical formulas.
- [Simple Pendulum Calculator](https://www.toolkk.com/tools/pendulum-calculator): Free online simple pendulum calculator. Calculate pendulum period and frequency based on length and gravity, or reverse-…
- [Escape Velocity Calculator](https://www.toolkk.com/tools/escape-velocity-calculator): Calculate the minimum escape velocity from any celestial body's surface, with support for custom celestial parameters.
- [Sum of Cubes Calculator](https://www.toolkk.com/tools/sum-cubes-calculator): Quickly calculate the sum of cubes for integer sequences. Supports custom number lists or continuous ranges for math and…
- [Difference of Cubes Calculator](https://www.toolkk.com/tools/diff-cubes-calculator): Calculate the difference of cubes (a³-b³) instantly. Supports integers and decimals, ideal for math learning and algebra…
- [Geometric Mean Calculator](https://www.toolkk.com/tools/geometric-mean-calculator): Input a set of positive numbers, one-click calculation of geometric mean, commonly used for average growth rate, investm…
- [Quadratic Equation Calculator](https://www.toolkk.com/tools/quadratic-equation-calculator): Enter coefficients a, b, and c to instantly calculate the real or complex roots of a quadratic equation.
- [Line Slope Calculator](https://www.toolkk.com/tools/slope-calculator): Quickly calculate the slope of a line by entering the coordinates of two points. Free online slope calculator for math a…
- [Torque Unit Converter](https://www.toolkk.com/tools/torque-unit-converter): Quickly and accurately convert between different torque units, including common units like Newton-meters and foot-pounds…
- [Illuminance Unit Converter](https://www.toolkk.com/tools/illuminance-unit-converter): Quickly convert illuminance units including lux (lx), foot-candles (fc), and phots (ph).
- [Voltage Unit Converter](https://www.toolkk.com/tools/voltage-unit-converter): Quickly convert voltage units like volts, millivolts, and kilovolts online with support for batch calculations.
- [Average Acceleration Calculator](https://www.toolkk.com/tools/online-average-acceleration-calculator): Free online average acceleration calculator. Quickly find acceleration using initial velocity, final velocity, and time…
- [Scientific Calculator](https://www.toolkk.com/tools/scientific-calculator): Advanced scientific calculator supporting complex math operations and function calculations.
- [Correlation Coefficient Calculator](https://www.toolkk.com/tools/pearson-correlation-coefficient-calculator): Input two sets of continuous data, quickly calculate Pearson correlation coefficient R, and determine the strength of li…
- [Cylinder Calculator](https://www.toolkk.com/tools/cylinder-calculator): Free online cylinder calculator. Enter the radius and height to quickly find the base area, lateral area, total surface…
- [Electrolyte Replacement Calculator](https://www.toolkk.com/tools/electrolyte-replacement-calculator): Based on body weight, exercise duration, and sweat loss, estimate sodium, potassium, and water intake needed for optimal…
- [Absolute Value Calculator](https://www.toolkk.com/tools/absolute-value-calculator): Enter a real or complex number to instantly calculate its absolute value (modulus).
- [Variance Calculator](https://www.toolkk.com/tools/online-sample-variance-calculator): Free online variance calculator to quickly find sample variance, population variance, standard deviation, and mean. Easi…
- [F-Test Calculator](https://www.toolkk.com/tools/f-test-calculator): Enter the variance and sample size of two datasets to quickly calculate the F-statistic and p-value, and determine if th…
- [Harmonic Mean Calculator](https://www.toolkk.com/tools/harmonic-mean-calculator): Free online harmonic mean calculator. Easily calculate the harmonic mean of positive numbers for average speed, exchange…
- [Monthly Interest Payout Calculator](https://www.toolkk.com/tools/principal-withdrawal-calculator): Quickly calculate the monthly interest payout and total interest for fixed-principal deposits. Supports various principa…
- [Batch Latitude & Longitude Converter](https://www.toolkk.com/tools/latitude-longitude-batch-converter): Batch convert coordinates between WGS84, GCJ02, and BD09 online. Supports text paste and Excel upload with easy data exp…
- [Centripetal Force Calculator](https://www.toolkk.com/tools/centripetal-force-calculator): Quickly calculate the centripetal force required for uniform circular motion by entering mass, velocity, and radius.
- [Fixed Deposit Periodic Withdrawal Calculator](https://www.toolkk.com/tools/deposit-withdraw-calculator): Enter principal, annual interest rate, deposit term, and withdrawal interval to quickly calculate the periodic withdrawa…
- [Call Deposit Calculator](https://www.toolkk.com/tools/notice-deposit-calculator): Calculate notice deposit interest and total amount effortlessly, supporting 1-day and 7-day notice terms.
- [Lanzou Cloud Direct Link Parser](https://www.toolkk.com/tools/lanzou-direct-link-parser): Enter a Lanzou Cloud share link to instantly extract the real direct link for easy downloading or external linking.
- [二型糖尿病诊断计算器](https://www.toolkk.com/tools/type-2-diabetes-diagnosis-calculator): 根据年龄、体重指数、腰围、血压和家族史等指标，评估二型糖尿病患病风险，获取初步筛查建议。
- [音频编辑器](https://www.toolkk.com/tools/online-audio-editor): 在浏览器中直接裁剪、拼接、调整音频，无需安装任何软件，支持常见音频格式的导入与导出。
- [墙砖计算器](https://www.toolkk.com/tools/wall-tile-calculator): 输入墙面尺寸和砖规格，快速算出所需墙砖数量，含损耗和砖缝，帮你避免买多或买少。
- [涂料用量计算器](https://www.toolkk.com/tools/paint-calculator): 根据房间尺寸、门窗面积和涂料覆盖率，快速算出刷墙所需涂料升数和桶数。
- [常用js类库(CDN公共库)大全](https://www.toolkk.com/tools/common-js-libraries-cdn): 快速查找常用JS库的CDN链接，一键复制引入代码，提升前端开发效率。
- [零存整取计算器](https://www.toolkk.com/tools/zero-deposit-lump-sum-calculator): 在线计算零存整取到期本息，输入每月存入金额、存期和年利率，立即得出利息和到期总额。
- [文字转语音合成](https://www.toolkk.com/tools/online-text-to-speech-video-voiceover): 将文字快速转为真人语音，支持多种音色和语速调节，适用于视频配音、有声书和广播播报。
- [戒指尺寸对照表](https://www.toolkk.com/tools/ring-size-chart): 通过手指周长或直径，快速换算港码、美码、欧码、英码戒指尺寸，附带测量图解与常见误用提醒。
- [Bootstrap可视化布局工具](https://www.toolkk.com/tools/bootstrap-visual-layout-tool): 可视化拖拽生成Bootstrap栅格布局代码，快速搭建页面结构，无需手写HTML和CSS。
- [鞋子尺码对照表](https://www.toolkk.com/tools/shoe-size-conversion-chart): 输入脚长厘米数，快速查看中国码、欧码、美码、英码对应关系，海淘选鞋不再纠结。
- [裤子尺码对照表](https://www.toolkk.com/tools/pants-size-chart): 支持中国码、欧洲码、腰围厘米和英寸等多维度裤子尺码对照，快速找到你的尺码。
- [磁盘(硬盘)整数分区计算器](https://www.toolkk.com/tools/disk-partition-calculator): 输入想要的分区大小（GB），自动计算分区时需输入的MB数，避免出现99.9GB这类非整数显示。

## Development (139)

> Provides developer tools such as JSON, XML, YAML beautification and formatting, and code compression and obfuscation

- [PYC Decompiler](https://www.toolkk.com/tools/pyc-decomplie): Restore Python bytecode .pyc files into readable source code for easy code auditing and learning. Supports mainstream ve…
- [JSON Formatter](https://www.toolkk.com/tools/json-formatter): Process JSON data online: format, minify, and validate to boost your development and debugging efficiency.
- [URL to JSON Parser](https://www.toolkk.com/tools/url-json-converter): Parse URL strings into structured JSON to quickly extract key information like protocols, parameters, and paths.
- [Code Compare](https://www.toolkk.com/tools/code-diff): Professionally compare differences between two texts or code snippets. Highlights additions, deletions, and modification…
- [JSON to TypeScript Converter](https://www.toolkk.com/tools/json-to-typescript-object): Automatically convert JSON data into TypeScript interfaces or type aliases for frontend data modeling and API integratio…
- [JSON to Python Class Converter](https://www.toolkk.com/tools/json-to-python-object): Automatically convert JSON data into standard Python class definitions for API responses, config files, and more.
- [JSON to Java POJO Generator](https://www.toolkk.com/tools/json-to-java-object): Automatically convert JSON strings into standard Java POJO class code for API integration, data modeling, and other deve…
- [PYC Version Checker](https://www.toolkk.com/tools/pyc-magic-number-detect): Identify the Python version of .pyc files via magic numbers to resolve compatibility issues.
- [DDL to JSON Converter](https://www.toolkk.com/tools/ddl-json-converter): Parse and convert SQL Data Definition Language (DDL) statements into a structured JSON data format.
- [JSON to Kotlin Data Class Converter](https://www.toolkk.com/tools/json-to-kotlin-object): Instantly convert JSON strings into Kotlin data class code with automatic nested structure handling and type inference.…
- [CSS and LESS Converter](https://www.toolkk.com/tools/css-less-converter): Convert between LESS and CSS code bidirectionally with support for variables, nesting, and other advanced features
- [XML to YAML & YAML to XML Converter](https://www.toolkk.com/tools/xml-yaml-converter): Accurately convert between XML and YAML formats. Supports custom indentation, attribute handling, and other parameters t…
- [JSON to XML & XML to JSON Converter](https://www.toolkk.com/tools/json-xml-converter): A two-way conversion tool for JSON and XML data structures, designed for development, testing, and data processing.
- [HTML to Markdown Converter](https://www.toolkk.com/tools/html-markdown-converter): Efficiently convert HTML to Markdown format with support for multiple custom style configurations.
- [JSON to CSV & CSV to JSON Converter](https://www.toolkk.com/tools/json-csv-converter): Convert seamlessly between JSON arrays and CSV tabular data. Ideal for data analysis and software development.
- [JSON to C# Class Converter](https://www.toolkk.com/tools/json-to-csharp-object): Automatically convert JSON data into C# class definitions, ideal for .NET developers building data models.
- [JSON to Swift Converter](https://www.toolkk.com/tools/json-to-swift-object): Instantly parse standard JSON data into Codable-compliant Swift structs or classes for iOS and macOS development.
- [JSON to Objective-C Class Generator](https://www.toolkk.com/tools/json-to-objective-c-object): Automatically generate Objective-C model classes from JSON data for iOS and macOS development.
- [JSON to Dart Class Generator](https://www.toolkk.com/tools/json-to-dart-object): Automatically convert JSON data into Dart data models for Flutter and Dart development. Supports null safety and nested…
- [Morse Code Generator](https://www.toolkk.com/tools/morse-code-generator): Convert text to Morse code audio and symbol sequences with customizable tone and rhythm parameters.
- [CSS Formatter](https://www.toolkk.com/tools/css-beautify-formater): Format and beautify CSS code to improve readability and maintainability. Supports custom indentation rules.
- [SQL Formatter & Beautifier](https://www.toolkk.com/tools/sql-beautify-formater): Format and beautify messy SQL code to improve readability.
- [Stylus to CSS](https://www.toolkk.com/tools/css-stylus-converter): Convert Stylus preprocessor code to standard CSS stylesheets
- [HTML to JS String Converter](https://www.toolkk.com/tools/html-js-converter): Convert HTML code into escaped strings that can be directly embedded into JavaScript, making dynamic web content generat…
- [Stylus to LESS Converter](https://www.toolkk.com/tools/stylus-less-converter): Convert Stylus syntax code to standard LESS format, suitable for front-end project migration and team collaboration.
- [SQL Minifier](https://www.toolkk.com/tools/sql-minify): Remove spaces, line breaks, and comments from SQL statements. Minify SQL into a single line of code to save storage spac…
- [Free Online HTML Formatter & Beautifier](https://www.toolkk.com/tools/html-beautify-formater): A free online HTML formatter and beautifier for developers and web designers. Customize indentation and line breaks to i…
- [GB2312 Character Encoding Lookup](https://www.toolkk.com/tools/gb2312-encode-query): A GB2312 encoding lookup tool — enter a Chinese character to get its area code, GB national-standard code, and internal…
- [JSON to C++ Struct Converter](https://www.toolkk.com/tools/json-to-cpp-object): Automatically map JSON data structures to C++ class or struct definitions for rapid generation of data models used in AP…
- [XML to CSV & CSV to XML Converter](https://www.toolkk.com/tools/xml-csv-converter): Achieve precise bidirectional conversion between structured XML data and CSV tables. Supports custom delimiters, headers…
- [JSON to PHP Array Converter](https://www.toolkk.com/tools/json-to-php-array): Quickly convert JSON data into ready-to-use PHP array code. Perfect for API integration and configuration migration.
- [JavaScript Events Reference Table & Compatibility List](https://www.toolkk.com/tools/javascript-events-list): An online reference guide for front-end developers to quickly look up JavaScript event names, categories, and browser co…
- [XML Formatter](https://www.toolkk.com/tools/xml-beautify-formater): Convert messy XML code into a clearly structured, standard format to improve development efficiency and code readability…
- [JSON to YAML & YAML to JSON Converter](https://www.toolkk.com/tools/json-yaml-converter): Bidirectionally convert between JSON and YAML structured data formats, with support for custom output styling.
- [YAML / CSV Converter](https://www.toolkk.com/tools/yaml-csv-converter): Convert between YAML and CSV formats. Supports custom headers, delimiters, and efficient structured data processing.
- [Android Permission Lookup & Reference Guide](https://www.toolkk.com/tools/android-permissions-description): Provides developers and users with instant plain English names and functional descriptions for standard Android permissi…
- [JSON to Rust Struct Converter](https://www.toolkk.com/tools/json-to-rust-object): Instantly convert JSON data into Rust struct code for seamless API integration, data processing, and model definitions.
- [JSON to Go Struct Converter](https://www.toolkk.com/tools/json-to-go-object): Convert JSON data into Go struct definition code for API integration and data modeling.
- [Online JWT Parser & Decoder](https://www.toolkk.com/tools/jwt-token-decoder): Parse JWT headers, payloads, and key information online. No installation required—just paste and decode.
- [HTML Minifier](https://www.toolkk.com/tools/html-code-minify): Minify HTML code online by removing spaces, comments, and redundant characters. Optimize CSS, JS, and SVG to reduce file…
- [VS Code Shortcuts Finder](https://www.toolkk.com/tools/vscode-shortcut-key-query): Search VS Code keyboard shortcuts by function or key combination. Get cross-platform (Windows, Mac, Linux) mappings to b…
- [HTML to PHP Converter](https://www.toolkk.com/tools/html-php-converter): Quickly convert HTML code into PHP scripts for dynamic web development. Easily integrate PHP logic and improve code modu…
- [GBK Encoding Lookup](https://www.toolkk.com/tools/gbk-encode-query): Look up the mapping between characters and their GBK encodings, with fast two-way search.
- [JSON to Haskell Data Type Converter](https://www.toolkk.com/tools/json-to-haskell-object): Automatically convert JSON data into Haskell data/newtype definitions. Generate Aeson-ready code instantly to boost your…
- [Random Hex Generator](https://www.toolkk.com/tools/random-hex): Generate random hex strings of any specified length on demand. Perfect for development testing, unique identifiers, and…
- [CSS Minifier](https://www.toolkk.com/tools/css-minify): Efficiently minify CSS code by removing redundant characters to boost page load performance.
- [XML Compressor](https://www.toolkk.com/tools/xml-minify): Remove extra whitespace and comments from XML to reduce file size and optimize transfer and storage efficiency.
- [JSON to Ruby Class Converter](https://www.toolkk.com/tools/json-to-ruby-object): Automatically convert JSON data into Ruby class definitions. Generate code with properties and initialize methods for se…
- [Country & Language Code Reference](https://www.toolkk.com/tools/i18n-language-code-table): Look up standard language codes for countries, searchable by Chinese or English name, to quickly find codes like zh-CN a…
- [Nano ID Generator](https://www.toolkk.com/tools/nanoid-generator): Generate secure, unique, and URL-friendly identifiers for database IDs, API keys, and more.
- [License Plate Generator](https://www.toolkk.com/tools/random-car-id): Generate random license plates for software testing and development.
- [URL Redirect Checker](https://www.toolkk.com/tools/url-redirection-checker): Analyze URL redirect paths and HTTP status codes to diagnose redirect issues and boost your SEO.
- [Gzip Encoder & Decoder](https://www.toolkk.com/tools/gzip-encoding): Free online Gzip compressor and decompressor. Instantly compress text to Base64 Gzip format or decode Base64 Gzip string…
- [String Escape & Unescape Tool](https://www.toolkk.com/tools/escape-converter): Process special character escaping and unescaping for HTML, URL, and JS formats. Perfect for web development and data pr…
- [Blank Code Generator](https://www.toolkk.com/tools/blank-code-generator): Quickly generate blank code templates and placeholders for various programming languages.
- [JSON Schema Generator](https://www.toolkk.com/tools/generate-json-schema): Automatically convert JSON data to Schema to simplify data structure definitions.
- [JSONPath Evaluator](https://www.toolkk.com/tools/jsonpath-parser): Accurately extract data from JSON documents using JSONPath expressions. Supports recursive queries and filter expression…
- [Python Regex Tester](https://www.toolkk.com/tools/python-regex-test): Test Python regular expression patterns online. Get real-time match results, capture groups, and position info to quickl…
- [HTML Source Viewer](https://www.toolkk.com/tools/website-source-code-viewer): View and analyze the HTML source code of any webpage online. A fast and free tool to assist with front-end web developme…
- [Spider Crawl Simulator](https://www.toolkk.com/tools/sipder-crawling-simulator): Simulate search engine spiders to crawl web pages. Check HTTP crawl status, response headers, and view the raw HTML page…
- [Code to Image Tool](https://www.toolkk.com/tools/code-to-image-screenshot-beautifier): Generate beautiful code screenshots with one click, supporting multi-language syntax highlighting and customizable theme…
- [UUID Format Converter & Validator](https://www.toolkk.com/tools/uuid-format-convert-verify): Professionally handle UUID format conversions and validity checks. Supports multiple formats including standard, pure he…
- [Java Regex Tester](https://www.toolkk.com/tools/java-regex-test): Test Java regular expressions online. Real-time match verification and capture group extraction for faster debugging and…
- [JSON to JSON Schema Converter](https://www.toolkk.com/tools/json-to-schema): Automatically convert JSON data structures into JSON Schema definitions for seamless data validation and API documentati…
- [Kubernetes Image Mirror Finder](https://www.toolkk.com/tools/kubernetes-china-mirror-query): Find China mirror URLs for Kubernetes components to fix slow access to official registries.
- [Golang Regex Tester](https://www.toolkk.com/tools/golang-regex-test): An online regex tester designed for Go developers. Validate RE2 syntax rules and view match results and capture groups i…
- [XPath Online Tester](https://www.toolkk.com/tools/xpath-online-test-tool): Test XPath expressions right in your browser and see matches instantly — great for web scraping, data collection, and fr…
- [Character Encoding Detector](https://www.toolkk.com/tools/charset-encoding-info-query): Quickly identify text encoding types and fix gibberish text.
- [Mermaid Chart Generator](https://www.toolkk.com/tools/mermaid-generator): Generate Mermaid chart code online. Supports multiple types including flowcharts and sequence diagrams.
- [C/C++ Code Formatter & Beautifier](https://www.toolkk.com/tools/cpp-code-formater): Free online C/C++ code formatter and beautifier. Quickly standardize indentation, brace styles, and format your C and C+…
- [Top-Level Domain (TLD) Directory](https://www.toolkk.com/tools/top-level-domain-tlds-list): Search 900+ top-level domain suffixes worldwide in one place, including type, managing organization, and registration re…
- [Cron Expression Generator](https://www.toolkk.com/tools/cron-generator): Generate Cron expressions online and visually configure scheduled tasks.
- [URL Unshortener](https://www.toolkk.com/tools/short-link-unshortener): Paste a short link to quickly reveal the original long URL. Expand shortened URLs safely and check where they redirect b…
- [Shannon Entropy Calculator](https://www.toolkk.com/tools/shannon-entropy-calculator): Calculate the information entropy of text or data sequences to evaluate uncertainty and randomness.
- [Random File Generator](https://www.toolkk.com/tools/random-file-generator): Generate random files of any size and format on demand, including text and binary data formats.
- [JSON Minifier](https://www.toolkk.com/tools/json-minify): Remove unnecessary whitespace from JSON and minify formatted data into a compact single line to boost transfer efficienc…
- [System and Browser Info Checker](https://www.toolkk.com/tools/local-browser-info-query): Instantly check your client operating system, browser version, screen resolution, and other detailed system parameters i…
- [JSON to JavaScript Class Converter](https://www.toolkk.com/tools/json-to-javascript-object): Convert JSON data into ES6 JavaScript classes. Automatically generates nested classes and constructors to streamline you…
- [ASCII Code Lookup & Converter](https://www.toolkk.com/tools/ascii-query): Convert between characters and ASCII codes. Supports decimal, hexadecimal, and binary formats.
- [C# Code Formatter](https://www.toolkk.com/tools/csharp-code-formater): Free online C# code formatter and beautifier. Instantly standardize indentation, fix layout issues, and improve your cod…
- [JSON to Elm Type Definition Converter](https://www.toolkk.com/tools/json-to-elm-object): Convert JSON data into Elm type aliases and record definitions. Generate accurate data model code instantly for Elm deve…
- [JSON to TypeScript Zod Schema Converter](https://www.toolkk.com/tools/json-to-typescript-zod-object): Automatically convert JSON data structures into TypeScript Zod validation code to improve frontend development efficienc…
- [CSS Selector Tester](https://www.toolkk.com/tools/css-selector-query): Verify CSS selector matches in HTML and quickly locate elements.
- [JSON Data Generator](https://www.toolkk.com/tools/template-data-generator): Quickly generate structured test data using template syntax. Supports JSON, XML, and CSV formats.
- [Font Awesome Icon Finder](https://www.toolkk.com/tools/fontawesome-icons-query): Quickly find Font Awesome icon names, CSS class names, and Unicode values.
- [JSON to Effect Schema Converter](https://www.toolkk.com/tools/json-to-typescript-effect-schema-object): Convert JSON data structures into TypeScript Effect Schema code to provide a type-safe data validation solution.
- [JSON to Pike Class Converter](https://www.toolkk.com/tools/json-to-pike-object): Convert JSON data structures into Pike language class definitions, simplifying data modeling and coding workflows.
- [JSON to Flow Class Converter](https://www.toolkk.com/tools/json-to-flow-object): Automatically convert JSON data into Flow class code to simplify data model development. Supports custom naming conventi…
- [JSON to PHP Class Generator](https://www.toolkk.com/tools/json-to-php-object): Automatically convert JSON data structures into PHP classes with support for type hinting and nested objects to boost de…
- [Python Code Formatter](https://www.toolkk.com/tools/python-code-formater): Free online Python code formatter and beautifier. Automatically indent and organize your scripts to improve readability…
- [JSON to cJSON Struct Converter](https://www.toolkk.com/tools/json-to-cjson-object): Automatically convert JSON data into C language structs or cJSON object code for parsing JSON in C/C++ projects.
- [JSON Syntax Highlighter](https://www.toolkk.com/tools/json-color): Free online JSON syntax highlighter. Colorize and format JSON strings to easily visualize data hierarchy, structure, and…
- [JSON to Elixir Struct Converter](https://www.toolkk.com/tools/json-to-elixir-object): Convert JSON strings into Elixir structs or Map code. Ideal for API data processing and data modeling.
- [Favicon Extractor](https://www.toolkk.com/tools/favicon-fetch): Extract and download favicons from any website instantly. Free online tool to grab high-resolution website icons with pr…
- [JSON to Scala 3 Case Class Converter](https://www.toolkk.com/tools/json-to-scala3-object): Convert JSON data structures into Scala 3 case class code with automatic type inference to boost development efficiency.
- [Docker Registry Mirror Finder](https://www.toolkk.com/tools/docker-china-mirror-query): Get major Docker registry mirrors in China with one click to fix slow Docker Hub access.
- [JSON to Crystal Class Converter](https://www.toolkk.com/tools/json-to-crystal-object): Convert JSON data into Crystal class definitions and automatically generate type-safe serialization code.
- [Random JSON Data Generator](https://www.toolkk.com/tools/random-json): Generate random JSON mock data based on template structures for development and testing.
- [Advanced JS Obfuscator](https://www.toolkk.com/tools/js-encrypt): Free online Advanced JavaScript Obfuscator. Encrypt and obfuscate your JS code to protect source code, prevent reverse e…
- [Bootstrap Glyphicons Finder](https://www.toolkk.com/tools/bootstrap-icons-query): Free online Bootstrap Glyphicons finder. Quickly search and copy CSS class names and Unicode values for Bootstrap 3 icon…
- [WebSocket Tester](https://www.toolkk.com/tools/websocket-tester): Quickly connect to WebSocket servers, send and receive messages in real-time, and monitor communication status online.
- [Baidu URL Submission Tool](https://www.toolkk.com/tools/baidu-url-submition): Free online Baidu URL submission tool. Actively push website links to Baidu to accelerate page indexing and content upda…
- [JSON to PropTypes Converter](https://www.toolkk.com/tools/json-to-Javascript-proptypes-object): Automatically convert JSON data structures into React PropTypes validation code to boost your front-end development effi…
- [Java Code Formatter](https://www.toolkk.com/tools/java-code-formater): Quickly format and beautify Java code online. Standardize indentation and line breaks to output clean, readable source c…
- [PHP Code Formatter & Beautifier](https://www.toolkk.com/tools/php-code-formater): Free online PHP code formatter and beautifier. Automatically format, indent, and organize your PHP scripts to improve re…
- [JavaScript Obfuscator](https://www.toolkk.com/tools/js-confusion): Free online JavaScript obfuscator to hide your original logic, protect source code, and prevent reverse engineering or u…
- [Python Operator Precedence Checker](https://www.toolkk.com/tools/level-python-query): Quickly check the precedence and associativity rules for all Python operators with our free online lookup tool.
- [Extended ASCII Lookup](https://www.toolkk.com/tools/eascii-query): Free online Extended ASCII (EASCII) lookup tool. Quickly find characters, decimal, hex, octal, binary, and HTML entities…
- [ADB Command Cheat Sheet](https://www.toolkk.com/tools/adb-command-reference): Quick reference for essential Android Debug Bridge (ADB) commands. Easily look up commands for device connection, app ma…
- [Bulk IndexNow URL Submitter](https://www.toolkk.com/tools/indexnow-submit): Free online bulk IndexNow URL submitter. Instantly ping search engines like Bing and Yandex to crawl and index your new…
- [JavaScript Regex Tester](https://www.toolkk.com/tools/javascript-regex-test): Test and debug JavaScript regular expressions in real-time, with detailed match results, capture groups, and index infor…
- [pip Mirror Configuration Generator](https://www.toolkk.com/tools/pip-china-mirror-query): Instantly generate pip mirror configurations to solve slow Python package downloads and boost development efficiency.
- [JSON Compare](https://www.toolkk.com/tools/json-diff): Accurately compare two JSON files or snippets to quickly locate added, deleted, and modified fields.
- [HTML/JS/CSS Code Filter](https://www.toolkk.com/tools/html-filter): Free online HTML, JS, and CSS code filter. Easily strip tags, remove scripts, and clean up stylesheets to extract pure t…
- [JSON and GET Converter](https://www.toolkk.com/tools/json-get-converter): Free online JSON and GET parameter converter. Quickly convert between URL query strings and JSON objects.
- [VBScript Code Formatter](https://www.toolkk.com/tools/vbs-code-formater): Free online VBScript code formatter and beautifier. Automatically standardize indentation and line breaks for your VBS s…
- [Linux Command Reference](https://www.toolkk.com/tools/linux-command-query): Search Linux command usage, options, and examples. Quickly master terminal commands and parameters online.
- [C++ Operator Precedence Checker](https://www.toolkk.com/tools/level-cpp-query): Quickly check C++ operator precedence and associativity to help understand the evaluation order of complex expressions.
- [JavaScript Operator Precedence Checker](https://www.toolkk.com/tools/level-javascript-query): Quickly check JavaScript operator precedence and associativity to avoid logic errors in your code.
- [JSON to SQL Converter](https://www.toolkk.com/tools/json-to-sql): Free online tool to quickly convert JSON data into SQL INSERT statements. Supports both array and object formats.
- [Online JSON to TOML Converter](https://www.toolkk.com/tools/online-json-to-toml-converter): Quickly convert JSON data to TOML format. A free online tool perfect for migrating configuration files.
- [JSON to JSON Schema Converter](https://www.toolkk.com/tools/json-to-jsonschema-object): Automatically generate JSON Schema definitions from JSON data structures for data validation and API documentation.
- [JSON to Smithy Model Converter](https://www.toolkk.com/tools/json-to-smithy-object): Automatically convert JSON data structures into Smithy IDL model definitions to simplify your API design and service mod…
- [AI SEO Meta 生成器](https://www.toolkk.com/tools/ai-seo-meta-generator): 输入网页主题，AI 自动输出符合搜索规范的 Title、Description 与 Keywords，快速提升页面收录与点击率。
- [JSON to Protobuf Converter](https://www.toolkk.com/tools/json-to-protobuf): Free online JSON to Protobuf converter. Instantly generate Protocol Buffers message definitions from JSON data.
- [Ruby Code Formatter](https://www.toolkk.com/tools/ruby-code-formater): Free online Ruby code formatter and beautifier. Automatically fix indentation, organize syntax, and instantly improve yo…
- [Perl Code Formatter & Beautifier](https://www.toolkk.com/tools/perl-code-formater): Free online Perl code formatter and beautifier. Automatically indent and align your scripts to output clean, standardize…
- [Online PHP Function Reference](https://www.toolkk.com/tools/php-function-query): Enter a PHP function name to quickly look up its description, parameters, and return values online.
- [C# Operator Precedence Table](https://www.toolkk.com/tools/level-net-query): Quickly check C# operator precedence and associativity with this free online reference table.
- [C Operator Precedence Checker](https://www.toolkk.com/tools/leve-c-query): Check C operator precedence and associativity online to easily understand and evaluate complex expressions.
- [Java Operator Precedence Checker](https://www.toolkk.com/tools/level-java-query): Quickly check Java operator precedence with our free online reference tool. Get a complete precedence table and associat…
- [PHP Operator Precedence Checker](https://www.toolkk.com/tools/level-php-query): Quickly check PHP operator precedence and associativity with this free online programming tool.
- [VB Operator Precedence Checker](https://www.toolkk.com/tools/level-vb-query): Quickly check Visual Basic operator precedence and associativity. Resolve VB expression calculation issues with this fre…
- [Objective-C Operator Precedence Cheat Sheet](https://www.toolkk.com/tools/level-oc-query): Free online quick reference cheat sheet for Objective-C operator precedence and associativity. Easily check execution or…
- [Go Operator Precedence Checker](https://www.toolkk.com/tools/level-go-query): Quickly check Go operator precedence and associativity to understand expression evaluation order. Free online Golang ope…
- [Web Keyword Density Checker](https://www.toolkk.com/tools/keyword-check): Check the frequency and density of keywords on a web page to support SEO optimization and improve search rankings.
- [Online TOML to JSON Converter](https://www.toolkk.com/tools/online-toml-to-json-converter): Free online TOML to JSON converter. Easily convert TOML configuration files into JSON format for seamless cross-platform…
- [CSS3代码生成器](https://www.toolkk.com/tools/css3-code-generator): 可视化调整圆角、阴影、渐变等CSS3效果，实时生成代码，快速应用到网页中。
- [HTML表格生成器](https://www.toolkk.com/tools/html-table-generator): 可视化拖拽生成HTML表格代码，支持合并单元格和样式设置，一键复制代码。

## Office (90)

> Integrates various document processing and conversion functions such as text deduplication, keyword extraction, PDF merging and splitting, and WORD format conve…

- [Random Email Generator](https://www.toolkk.com/tools/random-email-generator): Bulk generate random email addresses for testing and sign-ups with custom prefixes and domains.
- [Random Phone Number Generator](https://www.toolkk.com/tools/random-phone-number-generator): Generate random phone numbers by country, carrier, and prefix on demand for development, testing, and data simulation.
- [Random Decimal Generator](https://www.toolkk.com/tools/random-decimal-generator): Generate random decimals with a specified range, decimal places, and quantity. Ideal for data analysis, simulation exper…
- [Chinese D-Series Paper Size Lookup](https://www.toolkk.com/tools/cn-paper-sizes-query): Look up exact millimeter dimensions for D0 to D6 series paper based on the GB/T 19999-2003 national standard, suitable f…
- [US Paper Size Chart](https://www.toolkk.com/tools/us-paper-sizes-query): Check US standard paper sizes, including everyday, ANSI, and ARCH series. Features millimeter and inch conversions with…
- [B Series Paper Size Chart & Dimensions Guide](https://www.toolkk.com/tools/b-paper-sizes-query): Look up ISO 216 standard B series paper sizes. Get exact millimeter and inch dimensions for B0 to B10, plus a visual com…
- [Text Flipper](https://www.toolkk.com/tools/text-reverse): Flip text horizontally or vertically online. Supports multilingual and multiline content for creative design or special…
- [C Series Paper Size Chart & Envelope Dimensions](https://www.toolkk.com/tools/c-paper-sizes-query): Check ISO 269 standard C series envelope sizes with an exact millimeter and inch conversion chart and visual comparison…
- [Special Character Lookup](https://www.toolkk.com/tools/special-characters-query): Find Unicode codes and HTML entities by character name or symbol. Get accurate encoding info for web development, design…
- [Online Word Counter](https://www.toolkk.com/tools/word-count): Accurately count words, characters, letters, numbers, and punctuation marks. Perfect for writing, editing, and content a…
- [Duplicate Line Counter](https://www.toolkk.com/tools/text-deduplication-count): Quickly count the frequency of duplicate lines in your text. Ideal for data cleaning, log analysis, and text processing.
- [Word to HTML Converter](https://www.toolkk.com/tools/word-html-converter): Convert Word documents into web-ready HTML code to solve formatting and compatibility issues for online publishing.
- [German Paper Size Chart](https://www.toolkk.com/tools/de-paper-sizes-query): Check ISO 216 (DIN 476) German standard paper sizes online. Includes a complete mm and inches reference chart for A and…
- [Chinese Writing Grid Generator](https://www.toolkk.com/tools/tianzige-generator): Generate custom Tianzi grid practice paper to standardize Chinese character writing structure.
- [Taiwan Paper Size Lookup](https://www.toolkk.com/tools/tw-paper-sizes-query): Provides a millimeter size reference chart for Japanese Kiku and Chinese 4/6 paper formats, ideal for the printing, desi…
- [Online UBB Editor & Code Generator](https://www.toolkk.com/tools/ubb-editor): Online UBB code generator and editor for forum posting and blog formatting. Quickly convert plain text into UBB format.
- [Text Line Counter](https://www.toolkk.com/tools/text-line-count): Accurately count the number of lines in any text. Ideal for code auditing, document editing, and log analysis.
- [Find and Replace Text Tool](https://www.toolkk.com/tools/text-replace): Find and replace specific strings in your text online. Supports batch replacement, perfect for content editing, data cle…
- [PDF to XML Converter](https://www.toolkk.com/tools/pdf-to-xml): Convert PDF documents into structured XML format for easy data extraction and system integration.
- [Chinese Calligraphy Grid Generator](https://www.toolkk.com/tools/mizige-generator): Generate custom Chinese calligraphy grid paper to improve your handwriting and master character strokes.
- [Remove Duplicate Lines](https://www.toolkk.com/tools/text-deduplication): Remove duplicate lines from text to quickly clean up lists, logs, keywords, and other data.
- [Randomize List Order](https://www.toolkk.com/tools/list-disorder): Enter a text list to instantly get a randomly shuffled result, with one item per line.
- [Bulk ISBN Lookup](https://www.toolkk.com/tools/isbn-book-batch-query): Bulk fetch book metadata using ISBNs, including key details like title, author, and publisher.
- [Regular Expression Tester](https://www.toolkk.com/tools/regex-tester): Test regular expressions online, validate matches in real-time, and quickly extract text data.
- [Text Compare Tool](https://www.toolkk.com/tools/text-diff): Highlight additions, deletions, and modifications between two texts or code snippets. Ideal for document proofreading, v…
- [Regular Script Practice Sheet Generator](https://www.toolkk.com/tools/regular-script-copybook-generator): Generate free, printable regular script practice sheets with customizable text and grid formats.
- [HTML to UBB Converter | Free UBB to HTML Code Tool](https://www.toolkk.com/tools/html-ubb-converter): Instantly convert between HTML and UBB code. Perfect for forums, blogs, and cross-platform publishing to ensure formatti…
- [Text Numbering Tool](https://www.toolkk.com/tools/text-serial-number): Automatically add numbers or letters to multiple lines of text. Supports custom starting values and formats for easy lis…
- [Markdown to HTML Converter](https://www.toolkk.com/tools/markdown-to-html-converter): Convert Markdown text into standard HTML code. Perfect for developers and content creators.
- [Essay Paper Generator](https://www.toolkk.com/tools/composition-paper-generator): Customize and generate blank A4 essay paper PDFs online. Features custom word count markers and headers for printable wr…
- [Random Number Generator with Margin of Error](https://www.toolkk.com/tools/error-random-number): Generate random numbers with a specific margin of error. Ideal for testing, simulation, and data analysis.
- [Text Similarity Checker](https://www.toolkk.com/tools/text-similarity-detection): Intelligently compare the semantic similarity of two texts and get a 0 to 1 score. Ideal for plagiarism checks and conte…
- [Text to Handwriting Converter](https://www.toolkk.com/tools/handwritten-text-generate): Convert digital text into natural handwriting-style images. Supports customizable penmanship effects, perfect for person…
- [PDF to Markdown Converter](https://www.toolkk.com/tools/pdf-to-markdown): Accurately extract PDF text and convert it into standard Markdown format.
- [Mouse Tester](https://www.toolkk.com/tools/mouse-tester): Free online mouse tester to check your left, right, and middle buttons, plus scroll wheel. Quickly detect hardware issue…
- [Image to PDF](https://www.toolkk.com/tools/img-to-pdf): Batch convert JPG, PNG, and other images to PDF documents. Supports various layouts and color modes.
- [Custom Grid Generator](https://www.toolkk.com/tools/fangge-generator): Generate custom, pixel-perfect grids with adjustable rows, columns, line styles, and colors.
- [Text Case Converter](https://www.toolkk.com/tools/lowerupper): Instantly convert text case with one click. Supports four modes: uppercase, lowercase, title case, and sentence case.
- [VCF to Excel Converter](https://www.toolkk.com/tools/vcf-to-excel): Easily convert vCard (.vcf) contact files into Excel spreadsheets (.xlsx) online.
- [Blank Pinyin Practice Sheet Generator](https://www.toolkk.com/tools/pinyin-template-generator): Free Pinyin practice sheet generator. Create custom printable Tianzige writing templates in one click.
- [Clerical Script Copybook Generator](https://www.toolkk.com/tools/clerical-script-copybook-generator): Generate free printable Clerical Script (Lishu) calligraphy copybooks in PDF format for 3,500 common Chinese characters.
- [Student Name Tag Generator](https://www.toolkk.com/tools/student-name-tag-generator): Generate printable A4 grid student name tags online for free. Supports multiple themes and one-click export to high-qual…
- [段落抄写字帖生成](https://www.toolkk.com/tools/paragraph-copybook-generator): 一键将段落转为标准字格抄写模板，支持自定义排版与导出。
- [基础笔画字帖生成](https://www.toolkk.com/tools/basic-strokes-copybook-generator): 一键生成标准笔画字帖，自定义网格排版助力练字。
- [汉字听写生成](https://www.toolkk.com/tools/chinese-dictation-generator): 一键生成标准听写卷，支持自定义词汇与排版格式。
- [EML to PDF Converter](https://www.toolkk.com/tools/eml-to-pdf): Convert EML emails to standard PDF documents while preserving original formatting and attachments. Perfect for printing…
- [Remove Blank Pages from PDF](https://www.toolkk.com/tools/pdf-remove-blanks): Accurately identify and remove blank pages from PDFs to optimize document structure and reduce file size.
- [Chinese-English Spacing Tool](https://www.toolkk.com/tools/add-space-between-chinese-and-english): Automatically insert spaces between Chinese and English characters to optimize mixed text formatting.
- [Award Certificate Generator](https://www.toolkk.com/tools/award-certificate-generator): Free online award certificate maker. Choose from multiple templates to easily generate and download high-resolution cust…
- [PDF to Image Converter](https://www.toolkk.com/tools/pdf-to-image): Convert PDFs to PNG, JPG, and other image formats with customizable page ranges and resolutions.
- [Resize & Scale PDF Pages Online](https://www.toolkk.com/tools/pdf-scale-pages): Precisely adjust the display scale of specific pages in a PDF document to optimize reading or printing.
- [Full-Width & Half-Width Character Converter](https://www.toolkk.com/tools/full-half-width-converter): Convert between full-width and half-width characters with one click to fix inconsistent text formatting.
- [PDF to Word Converter](https://www.toolkk.com/tools/pdf-to-word): Convert PDFs to editable Word formats (DocX/Doc/Odt) while preserving the original layout.
- [PDF N-up Tool](https://www.toolkk.com/tools/pdf-multi-page-layout): Smartly arrange multiple PDF pages onto a single sheet to optimize printing and reading efficiency.
- [PDF to HTML Converter](https://www.toolkk.com/tools/pdf-to-html): Accurately convert PDF documents into HTML format. Ideal for web display and secondary editing.
- [Split PDF](https://www.toolkk.com/tools/pdf-split-pages): Extract specific pages or page ranges from a PDF to create a new, independent document.
- [HTML to PDF Converter](https://www.toolkk.com/tools/html-to-pdf): Convert HTML files to PDF online while preserving the original style and layout. Perfect for webpage archiving and print…
- [Lorem Ipsum Generator](https://www.toolkk.com/tools/lorem-ipsum): Quickly generate Latin placeholder text for design and typography. Supports paragraphs, sentences, and words.
- [Funnel Chart Generator](https://www.toolkk.com/tools/funnel-chart-generator): Generate custom funnel charts online to visually track conversion rates and analyze process flows.
- [Vacation Homework Tracker](https://www.toolkk.com/tools/holiday-homework-tracker): Customize days and subjects to instantly generate a free, printable homework tracker grid.
- [偏旁部首字帖生成](https://www.toolkk.com/tools/radical-copybook-generator): 一键生成偏旁部首字帖，支持自定义排版打印。
- [ISBN Lookup Tool](https://www.toolkk.com/tools/isbn-book-query): Quickly retrieve complete book metadata using an ISBN, including detailed information such as title, author, publisher,…
- [Batch File Type Identifier](https://www.toolkk.com/tools/file-type-batch-detector): Identify true file formats. Supports bulk uploads and determines file types using magic numbers instead of extensions.
- [PDF to CSV Converter](https://www.toolkk.com/tools/pdf-to-csv): Accurately extract PDF table data and convert it to CSV format for easy data analysis and processing.
- [Excel Function Lookup](https://www.toolkk.com/tools/excel-function-reference): Quickly look up common Excel functions by category. View syntax, parameters, and practical examples to build formulas fa…
- [Markdown to PDF Converter](https://www.toolkk.com/tools/markdown-to-pdf): Convert Markdown documents to PDF online while preserving formatting and images. Perfect for exporting technical documen…
- [Random Key Generator](https://www.toolkk.com/tools/card-no-password-generator): Generate highly complex random passwords to protect your financial accounts and sensitive information.
- [PDF to PPT](https://www.toolkk.com/tools/pdf-to-ppt): Convert PDF documents into editable PPTX, PPT, or ODP presentations while preserving text and images.
- [Organize PDF Pages](https://www.toolkk.com/tools/merge-pdfs): A single-file PDF tool to rearrange pages and remove signatures for optimized document structure.
- [Remove Pages from PDF](https://www.toolkk.com/tools/pdf-remove-pages): Accurately delete specific pages from PDF documents. Supports both single page and page range operations.
- [PDF Page Extractor](https://www.toolkk.com/tools/pdf-extract-page): Precisely extract specific pages from PDF documents. Supports custom page ranges and format retention.
- [Text Keyword Extractor](https://www.toolkk.com/tools/keyword-extraction): Extract core keywords from Chinese text using semantic analysis. Supports custom keyword quantities for content analysis…
- [Text Filter Tool](https://www.toolkk.com/tools/text-filter): Filter text content based on keywords and regular expressions. Supports include/exclude modes to quickly extract the inf…
- [PDF Password Remover](https://www.toolkk.com/tools/pdf-remove-password): Remove PDF open passwords online to unlock document access. Supports files up to 20MB.
- [Text Length Filter](https://www.toolkk.com/tools/text-length-filter): Quickly filter text by character count range and clean up sentences or paragraphs that don't meet your length requiremen…
- [Bulk Backlink Submitter](https://www.toolkk.com/tools/external-link-publish): Bulk submit your website to high-authority platforms to quickly build backlinks and boost your SEO rankings.
- [Class Schedule Maker](https://www.toolkk.com/tools/class-schedule-generator): Customize themes and class periods, generate high-resolution class schedules in one click, and export for printing.
- [Bing URL Submission Tool](https://www.toolkk.com/tools/bing-url-submission): Free online Bing URL submission tool. Quickly submit your website links to the Bing search engine to speed up crawling a…
- [AI 工作周报生成](https://www.toolkk.com/tools/ai-weekly-report): 输入每日工作要点与进度，AI 自动梳理逻辑并生成结构化、可直接提交的职场周报。
- [AI智能文章改写](https://www.toolkk.com/tools/ai-article-rewriter): 输入原文即可智能重组句式与词汇，精准保留核心语义，快速生成低重复率且符合人类表达习惯的新文本。
- [AI多语言文本翻译](https://www.toolkk.com/tools/ai-translator): 输入待翻译文本，AI引擎即时生成准确流畅的译文，保留原文语境与专业风格。
- [Tender & Bidding Search](https://www.toolkk.com/tools/tender-bid-query): Quickly search public tender notices and contract award results nationwide. Supports multi-dimensional filtering.
- [AI 文本摘要提取](https://www.toolkk.com/tools/ai-text-summarizer): 输入长篇文章或报告，AI 自动解析语义，精准提炼核心观点与关键信息，一键生成简明摘要，助力高效阅读与内容复用。
- [Duplicate Line Remover](https://www.toolkk.com/tools/line-reduce): Efficiently remove duplicate lines from text while preserving the original line order.
- [Excel Shortcut Finder](https://www.toolkk.com/tools/excel-shortcut-query): Quickly look up common Excel shortcuts with this free online tool. Supports category filtering and keyword search to boo…
- [Image to Text Extractor](https://www.toolkk.com/tools/text-extractor): AI-powered image text recognition to extract editable text in one click.
- [ODT to PDF Converter](https://www.toolkk.com/tools/odt-to-pdf): Convert OpenDocument Text (ODT) files to PDF format while preserving the original layout and content integrity for easy…
- [PDF to TXT Converter](https://www.toolkk.com/tools/pdf-to-text): Convert PDF documents to plain text format for easy content extraction and editing.
- [PowerPoint Shortcut Finder](https://www.toolkk.com/tools/ppt-shortcut-query): Quickly find essential PowerPoint keyboard shortcuts. Search by category or key combination to boost your presentation w…
- [Word Shortcut Finder](https://www.toolkk.com/tools/word-shortcut-query): Quickly search for common Microsoft Word keyboard shortcuts to boost your document editing efficiency.

## Image (109)

> Provides professional image processing tools such as QR code generation, ID photo creation, OCR recognition, image compression, watermark removal, and image for…

- [Pixel to Centimeter Converter](https://www.toolkk.com/tools/px-cm-converter): Input pixel values and PPI to instantly convert to corresponding physical length in centimeters, also supports reverse c…
- [Pixel to Millimeter Converter](https://www.toolkk.com/tools/px-mm-converter): Convert between pixels and millimeters based on PPI density. Supports custom density values, ideal for UI design and pri…
- [PX to REM Converter](https://www.toolkk.com/tools/px-rem-converter): A bidirectional PX to REM converter for front-end developers and designers, featuring customizable root font sizes.
- [PX to PT Converter](https://www.toolkk.com/tools/px-pt-converter): A pixel (PX) to point (PT) unit conversion tool for designers and developers. Supports custom PPI for typography and lay…
- [Random Color Generator](https://www.toolkk.com/tools/random-color-generator): Provides controllable random color generation for designers and developers, supporting multiple formats and hue filterin…
- [RGB to HSB Converter](https://www.toolkk.com/tools/rgb-hsb-converter): Two-way RGB and HSB/HSV color code converter supporting multiple input formats. Ideal for designers and developers.
- [Pixels to Inches Converter](https://www.toolkk.com/tools/px-inch-converter): Convert pixels to inches based on screen PPI. This free two-way converter (px to in and in to px) is perfect for graphic…
- [A-Series Paper to Pixels Converter](https://www.toolkk.com/tools/a-paper-size-to-pixels): Convert physical dimensions of ISO 216 standard paper sizes (A0-A13) to pixel values at a specified DPI/PPI for design,…
- [RGB & CIELab Color Converter](https://www.toolkk.com/tools/rgb-cielab-converter): Two-way conversion between RGB and CIELab color spaces, providing precise color mapping for designers and developers.
- [QR Code Generator](https://www.toolkk.com/tools/qrcode-generator): Encode text, links, and other information into scannable QR code images with customizable error correction levels and co…
- [A Series Paper Size Lookup](https://www.toolkk.com/tools/a-paper-sizes-query): Quickly check ISO 216 standard A-series paper sizes from A0 to A13. View accurate dimensions in both millimeters and inc…
- [PX to EM Converter](https://www.toolkk.com/tools/px-em-converter): A pixel and EM unit converter for front-end developers featuring custom base font sizes and real-time two-way conversion…
- [PX to Percentage Converter](https://www.toolkk.com/tools/px-percent-converter): Convert pixel values to percentages based on root font size. Ideal for CSS responsive design and fluid layouts.
- [RGB & CMYK Color Converter](https://www.toolkk.com/tools/rgb-cmyk-converter): Professional bidirectional RGB and CMYK color code converter. Fix screen-to-print color shifts and get accurate, real-ti…
- [Weibo Image Source Finder](https://www.toolkk.com/tools/weibo-image-identify): Parse Weibo image URLs to find the original uploader and trace the source of social media images.
- [Barcode Generator](https://www.toolkk.com/tools/barcode-generator): Enter data to generate 1D barcodes like EAN-13 and Code 128. Export PNG, JPEG, or SVG images for printing and scanning.
- [RGB / XYZ Color Space Converter](https://www.toolkk.com/tools/rgb-xyz-converter): A two-way converter for RGB and XYZ color codes, ideal for web design and image processing.
- [RGB to HEX Color Converter](https://www.toolkk.com/tools/rbg-hex-converter): Convert RGB and HEX color codes online. Get accurate color conversions for designers and developers.
- [RGB to HSL Color Converter](https://www.toolkk.com/tools/rgb-hsl-converter): An essential two-way color converter for designers and developers to instantly switch between RGB, HSL, and Hex color co…
- [B Series Paper to Pixels Converter](https://www.toolkk.com/tools/b-paper-size-to-pixels): Quickly convert standard B series paper sizes (B0-B10) to pixel values based on your specified DPI/PPI. Ideal for digita…
- [QR Code Decoder](https://www.toolkk.com/tools/qrcode-parser): Upload a QR code image to automatically extract its original text, URLs, contact info, and other data.
- [US Paper Size to Pixels Converter](https://www.toolkk.com/tools/us-paper-to-pixels): Accurately convert US standard paper sizes like Letter and Legal to pixel width and height based on DPI/PPI. Perfect for…
- [Free PNG & JPG Image Converter](https://www.toolkk.com/tools/png-jpg-converter): Easily convert between PNG and JPG/JPEG image formats online. Supports single file processing to meet your image compati…
- [Image to Base64 Converter](https://www.toolkk.com/tools/image-base64-converter): Convert JPG, PNG, and other image files to Base64 strings online. Generate Data URLs instantly for web development and d…
- [Favicon Generator](https://www.toolkk.com/tools/favicon-generator): Convert images into web-ready ICO icons. Supports multi-size output to perfectly fit any browser.
- [PNG to BMP & BMP to PNG Converter](https://www.toolkk.com/tools/png-bmp-converter): Convert PNG images to BMP format, or BMP to PNG, to easily meet your software compatibility and image editing needs.
- [C-Series Paper to Pixels Converter](https://www.toolkk.com/tools/c-paper-size-to-pixels): Convert ISO C0-C10 paper sizes to pixel dimensions based on DPI/PPI for screen or print. Ideal for designers and print p…
- [PNG & GIF Converter](https://www.toolkk.com/tools/png-gif-converter): Convert between PNG and GIF image formats online. Supports large files, ideal for processing web graphics and animations…
- [PNG and TIFF Converter](https://www.toolkk.com/tools/png-tiff-converter): Convert between PNG and TIFF image formats online. Supports high-resolution images and large file processing.
- [Solid Color Image Generator](https://www.toolkk.com/tools/solid-color-image-generator): Free online solid color image generator for any color and size, supports PNG/JPG download, perfect for placeholder image…
- [Radar Chart Generator](https://www.toolkk.com/tools/online-radar-chart-generator): Create custom radar charts online. Easily visualize and compare multi-dimensional data with our free spider chart maker.
- [Image Stitcher](https://www.toolkk.com/tools/image-stitcher): Seamlessly combine multiple images into a long picture or grid layout. A fast, free online photo stitcher for quick imag…
- [Remove Digital Signatures from PDF](https://www.toolkk.com/tools/pdf-remove-cert-sign): Remove digital signatures from PDFs while keeping the original content intact. Ideal for document editing and privacy pr…
- [Regular Hexagon Area Calculator](https://www.toolkk.com/tools/hexagon-area-calculator): Enter the side length of a regular hexagon to instantly calculate its exact area. Supports various numerical inputs, ide…
- [PNG to ICO Converter](https://www.toolkk.com/tools/png-to-ico): Free online PNG to ICO converter. Instantly convert PNG images to ICO icon files with 6 standard sizes automatically bun…
- [TV Color Gamut Converter](https://www.toolkk.com/tools/tv-color-gamut-converter): Convert values between different color gamut standards (NTSC, sRGB, DCI-P3, Adobe RGB, BT.2020) online, helping you unde…
- [GIF Merger](https://www.toolkk.com/tools/gif-merger): Merge multiple GIFs into a single, continuous animated file online. Fast, free, and easy to use.
- [Circular Segment Area Calculator](https://www.toolkk.com/tools/circular-segment-area-calculator): Calculate the area of a circular segment using chord length and height, or radius and central angle. Ideal for math educ…
- [Standard Paper Size to Pixels Converter](https://www.toolkk.com/tools/china-paper-to-pixels): A paper size to pixels converter based on the Chinese GB/T 148-1997 standard, supporting DPI calculations for common siz…
- [Annulus Area Calculator](https://www.toolkk.com/tools/annulus-area-calculator): Quickly calculate the area of an annulus by entering the inner and outer radii. Ideal for math education and engineering…
- [Photo Size to Pixels Converter](https://www.toolkk.com/tools/photo-paper-to-pixels): Quickly convert common photo and paper sizes to pixel dimensions by specifying the DPI. Perfect for printing, graphic de…
- [Stadium Area Calculator](https://www.toolkk.com/tools/stadium-area-calculator): Calculate the area of a standard track or stadium shape. Enter the straightaway length and radius for fast, accurate res…
- [Online Pie Chart Maker](https://www.toolkk.com/tools/online-pie-chart-generator): Create custom pie charts online for free. Input your data, adjust styles, and instantly generate and download your pie g…
- [Line Chart Generator](https://www.toolkk.com/tools/online-line-chart-generator): Free online line chart maker. Input your data to instantly generate custom line graphs. Customize titles, colors, and do…
- [Regular Pentagon Area Calculator](https://www.toolkk.com/tools/pentagon-area-calculator): Calculate the area of a regular pentagon based on its side length, perimeter, or diagonal. Ideal for math studies and en…
- [Passport & ID Photo Maker](https://www.toolkk.com/tools/id-photo-generator): AI ID photo generator with precise background removal. Supports international standard sizes and custom parameters with…
- [Triangle Area Calculator](https://www.toolkk.com/tools/triangle-area-calculator): Calculate the area of a triangle using base and height, two sides and the included angle, or Heron's formula. Ideal for…
- [Letter Icon Generator](https://www.toolkk.com/tools/letter-icon-generator): Input text to quickly generate circular or rounded square letter icons suitable for website icons, avatars, UI elements.
- [GIF Splitter](https://www.toolkk.com/tools/gif-splitter): Split GIFs frame by frame online and quickly export high-quality static images.
- [Image People Counter](https://www.toolkk.com/tools/static-crowd-counting-image): Use AI to count the number of people in an image. Supports JPG/PNG uploads and image resizing for accurate counting resu…
- [Blind Watermark Detector](https://www.toolkk.com/tools/image-blind-watermark-verification): Detect and extract invisible blind watermarks from images. Supports PNG/JPG formats and preprocessing scaling.
- [Rectangle Area Calculator](https://www.toolkk.com/tools/rectangle-area-calculator): Enter the length and width to automatically calculate the area of a rectangle. Ideal for math learning and engineering m…
- [Online Bar Chart Generator](https://www.toolkk.com/tools/online-bar-chart-generator): Enter your data to instantly generate a clear bar chart. This free online tool supports custom labels, colors, and title…
- [Donut Chart Maker](https://www.toolkk.com/tools/online-ring-chart-generator): Generate custom donut charts online. Easily customize data, colors, and labels to visualize proportions and percentages…
- [Regular Polygon Area Calculator](https://www.toolkk.com/tools/regular-polygon-area-calculator): Enter the number of sides and side length to quickly calculate the area of any regular polygon. Ideal for geometry stude…
- [Square Area Calculator](https://www.toolkk.com/tools/square-area-calculator): Quickly calculate the area and perimeter of a square by entering its side length. Ideal for students and engineering tas…
- [Website Color Palette Generator](https://www.toolkk.com/tools/website-color-scheme): Generate professional website color palettes instantly. Get matching color schemes, HEX and RGB codes, and design sugges…
- [Business Card Size to Pixels Converter](https://www.toolkk.com/tools/business-card-to-pixels): Convert physical business card dimensions to pixel values. Supports custom DPI settings for both print design and screen…
- [JPG to ICO Converter](https://www.toolkk.com/tools/jpg-to-ico): Free online JPG to ICO converter. Easily convert JPG images into multi-size ICO files containing up to 6 different dimen…
- [Add Invisible Watermark to Image](https://www.toolkk.com/tools/image-invisible-watermark-embedding): An invisible digital watermarking solution for PNG and JPG images to effectively protect your copyright and prevent imag…
- [Rounded Image Generator](https://www.toolkk.com/tools/image-rounded-corner): Easily add rounded corners to images online for free. Customize the border radius and export high-quality PNGs with tran…
- [Rhombus Area Calculator](https://www.toolkk.com/tools/rhombus-area-calculator): Enter the diagonal lengths of a rhombus to automatically calculate its area. Ideal for math studies and engineering meas…
- [GIF Maker](https://www.toolkk.com/tools/gif-maker): Convert images or videos to animated GIFs online for free. Supports custom cropping, frame rate adjustments, and secure…
- [Kite Area Calculator](https://www.toolkk.com/tools/kite-area-calculator): Quickly calculate the area of a kite using the lengths of its two diagonals. Ideal for students, teachers, and designers…
- [SVG to PNG Converter](https://www.toolkk.com/tools/svg-to-png): Quickly convert SVG vector graphics to high-resolution PNG images online. Supports custom dimensions.
- [Photo to Pencil Sketch Converter](https://www.toolkk.com/tools/photo-to-pencil): Easily convert your photos into realistic pencil sketches online with our smart photo to sketch tool.
- [Circle Image Generator](https://www.toolkk.com/tools/circular-image-generator): Quickly crop images into perfect circles for profile pictures or icons. Supports transparent backgrounds and custom colo…
- [RA/SRA Paper to Pixels Converter](https://www.toolkk.com/tools/ra-paper-to-pixels): Convert RA/SRA print paper dimensions (mm) to pixels. Supports custom DPI settings to meet your digital design and print…
- [ID & Passport Photo Checker](https://www.toolkk.com/tools/id-photo-check): Smartly check passport and ID photo compliance and adjust dimensions to ensure they meet official standards for visas, e…
- [JIS Paper to Pixels Converter](https://www.toolkk.com/tools/jis-paper-to-pixels): Accurately convert Japanese JIS standard paper sizes to pixels. Supports A and B series with custom DPI settings.
- [Web Safe Colors Chart](https://www.toolkk.com/tools/web-safe-colors): Explore the complete list of 216 Web safe colors. Easily look up color names, HEX codes, and RGB values for consistent c…
- [Image Compressor](https://www.toolkk.com/tools/image-compressor): Compress image size online with proportional resizing and optimize image quality.
- [Frosted Glass Image Generator](https://www.toolkk.com/tools/image-frosted-glass): Upload an image to generate a frosted glass effect with customizable blur parameters.
- [Text to Image Card Generator](https://www.toolkk.com/tools/text-card-generator): Quickly convert text into beautiful image cards with customizable styles.
- [Dead Pixel Test](https://www.toolkk.com/tools/screen-dead-pixel): Check your screen for dead, stuck, and bright pixels online to quickly evaluate monitor quality.
- [GIF Cropper](https://www.toolkk.com/tools/gif-cropper): Accurately crop GIF images online. Select specific areas, preserve animation quality, and export quickly.
- [PDF Cleaner](https://www.toolkk.com/tools/pdf-sanitize): A PDF cleaning tool that removes metadata, annotations, and unnecessary data to reduce file size and protect your privac…
- [Email Icon Generator](https://www.toolkk.com/tools/email-icon-generator): Enter an email address to generate a custom email icon in one click, great for personal branding and websites.
- [Online Whiteboard Drawing Pad](https://www.toolkk.com/tools/whiteboard-online): Free online whiteboard and drawing pad for quick doodles, sketching, and teaching. Features custom colors, eraser, and i…
- [Image Color Adjuster](https://www.toolkk.com/tools/image-color-adjust): Adjust image brightness and contrast online to quickly enhance your photo's colors.
- [3x3 Image Grid Splitter](https://www.toolkk.com/tools/image-grid-splitter): Automatically split your images into a 3x3 grid. Perfect for creating seamless social media grid posts.
- [GIF Compressor](https://www.toolkk.com/tools/gif-compressor): Compress GIFs online for free. Smartly reduce GIF file size while maintaining clear image quality and smooth animations.
- [Placeholder Image Generator](https://www.toolkk.com/tools/online-placeholder-image-generator): Quickly generate custom placeholder images with specific sizes, colors, and text. Perfect for web prototyping, documenta…
- [Edit PDF Permissions](https://www.toolkk.com/tools/pdf-change-permissions): Set PDF printing, copying, and editing permissions. Add open and owner passwords to secure your documents.
- [Image Flip and Rotate Tool](https://www.toolkk.com/tools/image-transform): Easily flip and rotate images online. Adjust image orientation with one click and export high-quality photos instantly.
- [Add Border to Image](https://www.toolkk.com/tools/image-border): Easily add custom color and width borders to your images. Quickly generate framed photos online.
- [Image Watermark Tool](https://www.toolkk.com/tools/image-watermark): Add custom watermarks to your images online to quickly protect your copyright and prevent image theft.
- [Portrait Background Remover](https://www.toolkk.com/tools/portrait-background-removal): Smart AI tool to separate portraits from backgrounds, generating transparent PNGs with custom size scaling support.
- [Image Resizer](https://www.toolkk.com/tools/image-resize): Quickly resize images online. Adjust image width and height with custom pixels or lock the aspect ratio for perfect scal…
- [Image Cropper](https://www.toolkk.com/tools/image-crop): Free online image cropper. Easily drag the selection box to adjust aspect ratios, precisely crop out unwanted edges, and…
- [JPG & WEBP Converter](https://www.toolkk.com/tools/jpg-webp-converter): Free online bidirectional converter for JPG and WEBP formats. Fast, secure, and processed entirely locally in your brows…
- [JPG & AVIF Converter](https://www.toolkk.com/tools/jpg-avif-converter): Free online tool to convert between JPG and AVIF formats. Optimize image file sizes with secure, fast, in-browser proces…
- [Product Barcode Lookup](https://www.toolkk.com/tools/barcode-query): Look up product names, brands, prices, and manufacturer details by entering a barcode number or uploading an image.
- [Bulk QR Code Decoder](https://www.toolkk.com/tools/qrcode-batch-parser): Efficiently decode multiple QR codes from images in bulk. Automatically extract text, URLs, and other data to streamline…
- [HEIC to JPG Converter](https://www.toolkk.com/tools/heic-to-jpg): Convert iPhone HEIC images to standard JPG format. Processed locally in your browser with no uploads required.
- [PNG & AVIF Converter](https://www.toolkk.com/tools/png-avif-converter): Free online converter for bidirectional PNG and AVIF format conversion. Significantly reduce image file sizes while main…
- [Bulk QR Code Generator](https://www.toolkk.com/tools/qrcode-batch-generator): Bulk generate high error-correction QR codes via text or file upload. Customize styles and labels for marketing and info…
- [Bulk Barcode Generator](https://www.toolkk.com/tools/barcode-batch-generator): Supports bulk creation of barcodes in multiple formats. Ideal for product management, inventory labeling, and more.
- [PDF Encryption Tool](https://www.toolkk.com/tools/pdf-add-password): Set open passwords and edit permission passwords for PDF documents to keep sensitive content secure.
- [Sign PDF with Certificate](https://www.toolkk.com/tools/pdf-cert-sign): Add legally binding digital signatures to PDFs to ensure document authenticity and integrity.
- [Word to PDF Converter](https://www.toolkk.com/tools/word-to-pdf): Convert Word documents (DOC/DOCX) to high-quality PDFs while preserving the original formatting. Perfect for document ar…
- [Excel to PDF](https://www.toolkk.com/tools/excel-to-pdf): Convert Excel spreadsheets to PDF documents online while preserving the original formatting and layout. Ideal for sharin…
- [PPT to PDF Converter](https://www.toolkk.com/tools/ppt-to-pdf): Convert PowerPoint slides into high-fidelity PDF documents. Maintain original formatting and visual consistency for busi…
- [ODF to PDF Converter](https://www.toolkk.com/tools/odf-to-pdf): Convert open documents like ODT, ODS, and ODP to PDF online. Preserve original formatting for easy sharing and printing.
- [Text to PDF Converter](https://www.toolkk.com/tools/text-to-pdf): Convert plain text into standard PDF documents. Perfect for archiving, printing, and sharing.
- [Image Color Picker](https://www.toolkk.com/tools/image-color-picker): Accurately extract pixel colors from any image. Get HEX, RGB, and HSL color codes instantly with this free online image…
- [Holiday Profile Picture Frame Maker](https://www.toolkk.com/tools/festival-avatar-decoration): Easily add festive frames and borders to your profile picture online. Generate high-quality, custom holiday avatars for…
- [HEIC to PNG Converter](https://www.toolkk.com/tools/heic-to-png): Convert HEIC/HEIF images to PNG online for free. Preserves transparency and processes locally in your browser for maximu…
- [PNG ↔ WEBP Converter](https://www.toolkk.com/tools/png-webp-converter): Free online PNG ↔ WEBP bidirectional converter. Process images locally in your browser to reduce file size and protect y…

## Fun (53)

> Covers fun and interesting creative tools such as Martian text conversion, pet age, lucky numbers, and emoticons.

- [Martian Text Converter](https://www.toolkk.com/tools/martian-generator): Convert between Simplified Chinese, Traditional Chinese, and Martian text (Huoxingwen) for personalized online communica…
- [Random Chinese Address Generator](https://www.toolkk.com/tools/random-chinese-address-generator): Quickly generate random, fake Chinese addresses complete with provinces, cities, districts, streets, and postal codes. P…
- [Random Spanish Address Generator](https://www.toolkk.com/tools/random-spain-address-generator): Generate realistic, properly formatted fake Spanish addresses for development testing and data population.
- [Japanese Address Generator](https://www.toolkk.com/tools/random-japan-address-generator): Generate random fake Japanese addresses in valid formats, complete with zip codes, administrative divisions, and block n…
- [German Address Generator](https://www.toolkk.com/tools/random-germany-address-generator): Generate random, properly formatted German addresses for software testing, data population, and privacy protection.
- [Random US Address Generator](https://www.toolkk.com/tools/random-american-address-generator): Generate properly formatted fake US addresses for software testing, development, and data anonymization.
- [Lucky Number Calculator](https://www.toolkk.com/tools/lucky-number-calculator): Calculate your personal lucky number based on your Gregorian birthday and generate a custom visual badge.
- [Turkish Address Generator](https://www.toolkk.com/tools/random-turkey-address-generator): Generate random data that matches the Turkish address structure. Ideal for testing, development, and privacy protection.
- [Dog Age Calculator](https://www.toolkk.com/tools/dog-age-calculator): Enter your dog's age to convert it into human years and understand their current life stage.
- [QQ Account Value Calculator](https://www.toolkk.com/tools/qqjiazhi): Enter a QQ number to estimate its market value instantly. This tool calculates the worth of a QQ account based on factor…
- [Random UK Address Generator](https://www.toolkk.com/tools/random-uk-address-generator): Generate random UK-formatted addresses with valid postcodes, cities, and streets for testing and development.
- [Cat Age Calculator](https://www.toolkk.com/tools/cat-age-calculator): Accurately convert cat years to human years to understand your cat's life stage and health needs.
- [Random French Address Generator](https://www.toolkk.com/tools/random-france-address-generator): Generate properly formatted fake French addresses for testing, development, and privacy protection.
- [Dice Roller Simulator](https://www.toolkk.com/tools/dice-roll-simulator): Simulate real dice rolls online. Supports multi-sided dice and bulk rolling, instantly displaying individual results and…
- [Chinese Kinship Calculator](https://www.toolkk.com/tools/kinship-calculator): Parse complex family relationship chains and generate accurate Chinese kinship titles in one click to solve family namin…
- [Random Italy Address Generator](https://www.toolkk.com/tools/random-italy-address-generator): Generate properly formatted Italy addresses for software testing, data entry, and privacy protection.
- [Korean Address Generator](https://www.toolkk.com/tools/random-korean-address-generator): Generate random, properly formatted South Korean addresses with postal codes and districts. Ideal for software testing a…
- [Spin the Wheel Generator](https://www.toolkk.com/tools/lucky-wheel): Create a custom prize wheel online. Spin the wheel randomly to draw winners for giveaways, games, and interactive events…
- [Random Russian Address Generator](https://www.toolkk.com/tools/random-russia-address-generator): Generate random Russian addresses including zip codes, cities, streets, and building numbers for development and QA test…
- [Coin Flip Simulator](https://www.toolkk.com/tools/coinflip-simulator): Simulate a random coin flip (heads or tails) online to help you make quick decisions instantly.
- [Random Australian Address Generator](https://www.toolkk.com/tools/random-australia-address-generator): Generate fake Australian addresses for software testing and privacy protection.
- [Gomoku Game](https://www.toolkk.com/tools/gomoku-game): Play the classic Gomoku (Five in a Row) two-player board game online. Features undo, restart, and real-time sound effect…
- [Poland Address Generator](https://www.toolkk.com/tools/random-poland-address-generator): Generate random, properly formatted Poland addresses for software testing, data population, and privacy protection.
- [Minesweeper](https://www.toolkk.com/tools/minesweeper-game): Play the classic Minesweeper game online for free. Use number clues to deduce mine locations, clear the board, and exerc…
- [Random India Address Generator](https://www.toolkk.com/tools/random-india-address-generator): Quickly generate realistic fake Indian addresses across multiple states and cities. Perfect for software testing, form f…
- [Finland Address Generator](https://www.toolkk.com/tools/random-finland-address-generator): Generate random, properly formatted Finland addresses including street, city, and postal code. Ideal for software testin…
- [Ukraine Address Generator](https://www.toolkk.com/tools/random-ukraine-address-generator): Randomly generate realistic virtual Ukraine addresses with street, city, and zip code. Free online tool perfect for soft…
- [Online Piano Keyboard](https://www.toolkk.com/tools/online-piano-keyboard): Play our free online virtual piano keyboard. Features selectable instrument tones, quick chord lookup, and MIDI/MP3 reco…
- [Ultimate Special Symbols Collection](https://www.toolkk.com/tools/symbol-collection): Browse over 2,000 Unicode special symbols. Copy and paste to beautify your social media text instantly.
- [Random Canadian Address Generator](https://www.toolkk.com/tools/random-canada-address-generator): Generate random addresses in standard Canada Post format for testing, demonstrations, and privacy protection.
- [Random Brazil Address Generator](https://www.toolkk.com/tools/random-brazil-address-generator): Generate random, fake addresses in standard Brazilian formats for software testing, data simulation, and privacy protect…
- [Random Swedish Address Generator](https://www.toolkk.com/tools/random-sweden-address-generator): Generate random, properly formatted Swedish addresses for software testing, privacy protection, and mock data generation…
- [Sudoku Game](https://www.toolkk.com/tools/sudoku): Play Sudoku online with multiple difficulty levels and real-time hints to boost your logical thinking.
- [QQ Direct Chat Tool](https://www.toolkk.com/tools/qq-forced-chat-tool): Enter a QQ number to instantly generate a link that opens a direct chat window without adding them as a friend.
- [Acrostic Poem Generator](https://www.toolkk.com/tools/hidden-poem-generator): Generate acrostic or telestich poems in one click. Supports custom text and poetry styles.
- [Random Denmark Address Generator](https://www.toolkk.com/tools/random-denmark-address-generator): Generate realistically formatted fake Danish addresses. Ideal for development testing, data mockups, and privacy protect…
- [Dutch Address Generator](https://www.toolkk.com/tools/random-netherlands-address-generator): Generate correctly formatted fake Dutch addresses for software testing, QA, and privacy protection.
- [Group Ship Name Generator](https://www.toolkk.com/tools/cp-name-generator): Automatically generate creative group ship names and character pairings effortlessly.
- [Random Vietnam Address Generator](https://www.toolkk.com/tools/random-vietnam-address-generator): Generate properly formatted random Vietnamese addresses for software development testing, data mocking, and privacy prot…
- [Mouse Click Speed Test](https://www.toolkk.com/tools/cps-test-hand-speed-mouse-click-rate): Measure your mouse click speed (CPS) in real-time with this free online tool. Supports multiple time intervals, perfect…
- [Thailand Address Generator](https://www.toolkk.com/tools/random-thailand-address-generator): Generate fictional Thai addresses in valid format with accompanying identity information, suitable for form testing, dat…
- [Text to ASCII Art Generator](https://www.toolkk.com/tools/text-to-ascii-art): Convert plain text into visual ASCII art. Perfect for code comments, social media, and more.
- [Random Czech Address Generator](https://www.toolkk.com/tools/random-czech-address-generator): Generate properly formatted fake Czech addresses including street, city, and postal code. Ideal for software testing and…
- [Norway Address Generator](https://www.toolkk.com/tools/random-norway-address-generator): Generate fake addresses in standard Norwegian formats. Ideal for development testing, data mocking, and privacy protecti…
- [Gamepad Tester](https://www.toolkk.com/tools/gamepad-tester): Test your gamepad buttons, joysticks, triggers, and vibration online. Quickly diagnose controller performance issues.
- [MBTI Career Personality Test](https://www.toolkk.com/tools/mbti-career-test): Take the 28-question MBTI personality assessment to get your 4-letter type code and discover your career tendencies.
- [Big Five Personality Test (25 Questions)](https://www.toolkk.com/tools/big-five-personality-test-25): A 25-question personality test based on the OCEAN model. Quickly assess the Big Five traits and get a detailed personali…
- [Breath Counter](https://www.toolkk.com/tools/breathing-counter): Accurately track your breathing rate and total breaths. Ideal for health monitoring, sports training, and meditation.
- [Guess the Number Game](https://www.toolkk.com/tools/guess-number-game): Play the free online Guess the Number game. Guess a random number from 1 to 100, use higher/lower hints to narrow the ra…
- [Big Five Personality Test (60 Questions)](https://www.toolkk.com/tools/big-five-personality-test-60): A 60-question personality assessment based on the OCEAN model. Get a detailed 5-dimension personality report to boost se…
- [240-Question Big Five Personality Test](https://www.toolkk.com/tools/big-five-personality-test-240): A professional 240-question assessment based on the Big Five personality theory. Get a comprehensive five-dimension pers…
- [DISC Personality Test](https://www.toolkk.com/tools/disc-personality-test): Discover your workplace communication preferences, decision-making habits, and personal strengths through the DISC behav…
- [MBTI Career Personality Test (93 Questions)](https://www.toolkk.com/tools/mbti-test-93): A professional 93-question assessment based on MBTI theory that analyzes your personality type and career strengths, off…

## Media (28)

> A multimedia processing toolkit integrating video transcoding, audio extraction, format conversion, compression, and editing

- [Screen Recorder](https://www.toolkk.com/tools/screen-rec): Record your computer screen online for free with no watermarks and export high-quality HD videos.
- [Video Frame Extractor](https://www.toolkk.com/tools/video-frames-extract): Accurately extract keyframes or capture still images at specific timestamps from your videos. Supports multiple export f…
- [Video Watermark Remover](https://www.toolkk.com/tools/video-remove-logo): Intelligently remove logos, text, and other watermarks from videos. Supports multiple formats.
- [Reverse Video Tool](https://www.toolkk.com/tools/video-reverse): Precise frame-level video reverser supporting multiple formats and audio retention.
- [Video Trimmer](https://www.toolkk.com/tools/video-cut): Precisely trim video clips. Supports MP4, MOV, AVI, and MKV formats with original quality export.
- [Adjust Video Volume](https://www.toolkk.com/tools/video-volume-adjust): Precisely adjust the audio track volume of your video files with support for ±24dB lossless adjustments.
- [Video to GIF Maker](https://www.toolkk.com/tools/video-converter-gif): Convert video clips into animated GIFs, perfect for creating memes and sharing on social media.
- [屏幕录制专业版](https://www.toolkk.com/tools/screen-rec-pro): 专业屏幕录制：摄像头画中画、系统声+麦克风混音、4K/60fps、定时分段与多录制管理，本地处理不上传。
- [Convert Video to 3GP](https://www.toolkk.com/tools/video-converter-3gp): Convert MP4 and other videos to 3GP format for older mobile phones and low-bandwidth scenarios.
- [Video Color Filters](https://www.toolkk.com/tools/video-color-filters): Professional video color grading tool. Apply color filters in real-time and adjust brightness, contrast, and other param…
- [Video Merger](https://www.toolkk.com/tools/video-merge): Merge multiple video clips into a single video while keeping the original quality.
- [Flip Video](https://www.toolkk.com/tools/video-flip): Online tool to mirror and flip videos. Supports MP4, MOV, and other major formats with lossless processing.
- [Video Speed Controller](https://www.toolkk.com/tools/video-speed-adjust): Precisely adjust video playback speed with support for 0.1x to 4x processing.
- [Video Blur Tool](https://www.toolkk.com/tools/video-blur): Accurately blur sensitive areas in videos to protect privacy and confidential information.
- [Mute Video Tool](https://www.toolkk.com/tools/video-mute): Professionally remove audio tracks from videos to create silent videos.
- [Rotate Video](https://www.toolkk.com/tools/video-rotate): Accurately adjust video orientation and fix portrait to landscape misalignment.
- [Video to WEBM Converter](https://www.toolkk.com/tools/video-converter-webm): Convert MP4 and other videos to a web-optimized WEBM format to reduce loading times and improve playback smoothness.
- [Video to MOV Converter](https://www.toolkk.com/tools/video-converter-mov): Convert MP4 and other videos to MOV format for seamless playback and editing on Apple devices.
- [Video to MP4 Converter](https://www.toolkk.com/tools/video-converter-mp4): Convert AVI, MOV, WMV, and other formats to universal MP4 video files.
- [Convert Video to MKV Format](https://www.toolkk.com/tools/video-converter-mkv): Convert MP4, AVI, and other videos to multi-track MKV format while retaining original HD quality.
- [Video to FLV Converter](https://www.toolkk.com/tools/video-converter-flv): Convert MP4, AVI, and other videos to FLV format for legacy playback environments.
- [Video to WMV Converter](https://www.toolkk.com/tools/video-converter-wmv): Convert MP4 and other popular videos to WMV to resolve Windows compatibility issues.
- [AI Video Art Effects](https://www.toolkk.com/tools/video-art-effects): Add stunning art style effects to your videos, including oil painting, comic, and cyberpunk visual styles.
- [Add Video Borders](https://www.toolkk.com/tools/video-border): Smartly add borders and resize video aspect ratios for any platform without cropping the original content.
- [Video Chroma Adjuster](https://www.toolkk.com/tools/video-chroma-adjust): Professionally adjust video color parameters with precise control over saturation, hue, and chroma offset.
- [Video to AVI Converter](https://www.toolkk.com/tools/video-converter-avi): Convert MP4, MOV, and other videos to AVI format to fix device compatibility issues.
- [Video Color Correction](https://www.toolkk.com/tools/video-color-adjust): Professional video color adjustment tool with real-time preview and export.
- [AI Video Style Transfer](https://www.toolkk.com/tools/video-style-effects): AI-powered video art style transfer tool with multiple special effect filters.