Crafted with Care,Built for Every Tool

CJK to Unicode Converter

A bidirectional converter for CJK characters and Unicode code points. Supports multiple input formats to solve encoding issues in programming and text processing.

China Pharmaceutical Company Lookup

Search China pharmaceutical-company records by Chinese company name or address, including recorded licence and manufacturing-scope fields.

UTF-8 BOM Checker

Detect and remove BOM signatures from UTF-8 files in one click. Fix parsing errors in PHP and optimize file compatibility.

Bulk File MD5 Changer

Efficiently change file MD5 hashes in bulk to generate brand new hash codes, solving issues like duplicate file checks and upload restrictions.

Bulk MD5 File Checker

Bulk calculate MD5 hash values for files to verify integrity and consistency. Supports simultaneous multi-file processing to ensure data security.

Batch File Encoding Checker

Batch detect text file encoding formats to fix garbled text. Supports common types like UTF-8 and GBK.

Serpent Encryption & Decryption Tool

A text encryption and decryption tool based on the Serpent algorithm, supporting multiple key lengths and operation modes.

CAST Algorithm Encryption and Decryption

A symmetric encryption and decryption tool based on the CAST-128 algorithm. Supports text and Base64 encoding conversion to ensure secure data transmission.

Blowfish Encryption & Decryption Tool

Encrypt or decrypt data online using the Blowfish symmetric algorithm to ensure privacy and security. Supports multiple encoding formats including UTF-8, Base64, and Hex.

Bulk International Phone Validator

Validate global phone numbers in bulk and export format, country, carrier, and line type.

International Phone Number Validator

Validate a global phone number and retrieve its country, location, carrier, and line type.

Magnifier and Mirror

Use your phone camera to enlarge details in real time, with zoom, rear flashlight, and front camera mirror mode.

Magnetic Field Detector

Reads your phone’s magnetometer and shows magnetic field changes in µT, helping you find nearby magnetic objects and sources of interference.

Phone App Compass and Coordinates

Use the native App compass to read heading and optionally request and copy coordinates.

Phone App Bubble Level

Use the native App’s two-axis sensor display and bubble indicator to check approximate phone tilt.

Phone App Hardware Flashlight

Use the native App’s rear hardware torch in steady or SOS mode, with brightness where the device supports it.

Game Scoreboard

An online scoreboard for games, practice sessions, and friendly competitions. Edit the event and team names, adjust scores, undo mistakes, and use a pausable game timer.

Train Schedule and Seat Availability Query

Enter departure station, arrival station, and travel date to retrieve a train schedule and seat-availability snapshot. Actual service and ticketing are governed by 12306 and station notices.

Global Holidays and Observances

Find today’s global holidays, themed days, and observances. Basic access returns event listings; advanced date filters depend on the service plan.

Online Pomodoro Timer

An online Pomodoro timer based on the classic rhythm of 25-minute focus sessions, 5-minute short breaks, and 15-minute long breaks, with pause, reset, skip, and full-screen controls.

Online Stopwatch Timer

Free online stopwatch timer with no download required. Features one-click start/stop, lap tracking, and easy time copying.

Days Lived Calculator

Calculate exactly how many days you've lived since your date of birth. This free online calculator supports custom start and end dates for fast, accurate results.

Business Days Calculator

Accurately calculate the number of business days by automatically excluding weekends and custom holidays.

Week of the Year Calculator

Quickly and accurately calculate what week of the year it is today.

World City Time

Real-time global city time tracker and time zone converter

Beijing Time Sync

Online tool to sync Beijing Time and UTC, accurately calculating the time difference.

Sunrise and Sunset Times by City

Accurately calculate sunrise and sunset times, as well as daylight hours, for any location worldwide. Supports 30 years of historical data.

International Tax-Inclusive Price Calculator

Calculate net amount, tax, and gross price from an amount and location, including tax-inclusive conversions.

Global Tax Rate Lookup

Look up consumption tax rates by country, state, city, or postal code across 130+ countries and regions supported by the current data source.

International VAT Number Validation

Validate VAT number format and registration data across the 38 countries currently supported by the data source.

Bulk SWIFT/BIC Lookup

Validate SWIFT/BIC codes in bulk and export their bank, branch, country, and city.

SWIFT/BIC Code Lookup

Validate a SWIFT/BIC code and retrieve its bank, branch, country, city, and address.

Bulk IBAN Validator

Validate IBANs in bulk and export checksum, country, SEPA, bank, and BIC results.

International IBAN Validator

Validate an IBAN checksum and retrieve country, SEPA, bank, and BIC details.

Lottery Prize Result Check

Enter a supported type, draw number, and ticket numbers for an auxiliary prize check.

Lottery Winning Numbers

View one published draw by lottery type and optional draw number.

Iron Deficit Calculator

Estimate your total elemental iron requirement based on body weight and the difference between current and target hemoglobin.

Adult Height and Weight Chart (2026 Edition)

Find a reference weight for your height and use BMI to check your healthy weight range

Calories Burned Calculator

Estimate calories burned based on your weight, activity, and workout duration

Child Height and Weight Chart (2026)

Look up reference height and weight ranges by age and sex to understand your child’s growth and track changes over time.

Hepatitis B Panel (5-Test) Report Analyzer

Enter your hepatitis B panel results to quickly interpret the report, assess infection status, and check immunity.

Women's Ideal Body Measurements Chart

Quickly estimate ideal bust, waist, and hip measurements by height and better understand your body proportions.

Diabetes Meal Planner Calculator

Estimate your daily calorie needs and macronutrient targets based on your personal profile to support diabetes meal planning.

Chinese Gender Predictor Chart (2026)

Predict your baby's gender in 2026 using the traditional Chinese Gender Chart. Simply enter the mother's lunar age and conception month. For entertainment purposes only, not scientifically proven.

Child Vaccination Schedule

Generate a personalized 0-6 year child vaccination schedule by birth date. Easily track your baby's immunization plan and never miss a shot.

SSL Certificate Chain and Expiry Checker

Inspect the certificate information, validity dates, hostname coverage, and chain-related findings presented by a public HTTPS endpoint.

SSL Cipher Suite Checker

Enumerate the TLS cipher suites a public server accepts. Review legacy algorithms, negotiation options, and forward-secrecy findings for an HTTPS endpoint.

TLS Version Checker

Check which SSL/TLS protocol versions a public server accepts. Find legacy TLS 1.0 or 1.1 exposure and verify TLS 1.2 and 1.3 handshakes.

My IP Address Checker

See the IP address this device presents to ToolKK, including its version, address scope, and browser network status.

Multiple Search Engine Tool

Enter one query and create direct links for Google, Bing, DuckDuckGo, GitHub, Wikipedia, YouTube, and other search services.

ICP Filing Lookup

Look up ICP filing reference information by domain, including filing entity, filing number, site title, reported status, review date, and paged records.

URL Unshortener

Paste a short link to quickly reveal the original long URL. Expand shortened URLs safely and check where they redirect before clicking.

Top-Level Domain (TLD) Directory

Search 900+ top-level domain suffixes worldwide in one place, including type, managing organization, and registration restrictions.

Domain Checker

Check domain DNS records and HTTP status codes online to quickly diagnose website connectivity and network issues.

Multi-Number Subtraction Worksheet Generator

Generate subtraction chains with three or more integers and missing-number exercises. Customize the number range, layout, and print or export your worksheets.

Number Decomposition Worksheet Generator

Create elementary number decomposition worksheets with custom number ranges and question counts, ready to export as PDF or print.

Multi-Number Addition Worksheet Generator

Customize the number range and question count to generate multi-digit addition and missing-addend worksheets, with A4/A5 layouts and PDF export.

Make-a-Ten Subtraction Worksheet Generator

Create fill-in-the-blank make-a-ten worksheets for subtraction within 20. Customize the number of problems, paper size, and answer display, then export to PDF or Word for printing.

Subtract-to-Ten Practice Generator

Create step-by-step subtract-to-ten worksheets for first-grade subtraction within 20. Customize the layout and paper size, then export files locally.

Make-a-Ten Addition Worksheet Generator

Create customizable make-a-ten addition worksheets for early elementary students, with flexible question counts and layouts.

Unit Conversion Worksheet Generator

Create elementary math worksheets for length, weight, time, and area conversions. Customize the difficulty and layout, then export and print.

Number Sequence Worksheet Generator

Create printable elementary math worksheets with missing-number problems using arithmetic, geometric, and alternating sequences. Customize the difficulty and layout, then export your worksheet.

Number Comparison Worksheet Generator

Generate printable integer and decimal comparison worksheets with customizable ranges, precision, multi-column layouts, and answer keys.

Java Decompiler

Turn Java class, JAR, WAR, or EAR files into readable Java source and download the output as a ZIP.

Python Code Obfuscator

Minify and obfuscate Python source in your browser, with optional global-name and annotation handling.

PyInstaller Decompiler

Extract files from Windows and Linux PyInstaller programs and attempt to recover Python source from bytecode.

Cython to C Converter

Translate Python .py, Cython .pyx, or a project ZIP into C/C++ source files.

pyconcrete Python Encryptor

Encrypt one Python script or project ZIP into a .pyz and include a Linux runner matched to this build key.

Lua Bytecode Viewer

Inspect Lua compiled bytecode locally in your browser, including function prototypes, instructions, constants, and control flow.

Luau Static Analyzer and Type Checker

Analyze Roblox Luau snippets in the official Luau Playground and review type diagnostics and editor hints.

Lua / Luau Formatter and Syntax Checker

Paste Lua or Luau source, choose a dialect and style options, then format it or check syntax without changing the input.

Electron ASAR Extractor

Read ASAR archives locally in your browser and export their packaged files.

Resume Parser

Parse PDF, DOC, or DOCX resumes into contact, skills, education, and experience fields. Best tested in English, with support for common languages.

Repair PDF Files

Attempt to rebuild PDF cross-references and object structures so files that fail to open, parse, preview, or convert may work again.

Extract Images from PDF

Extract original embedded images from a PDF and download them as a ZIP. Ideal for retrieving photos, illustrations, and scanned images without capturing entire pages.

Crop PDF Pages

Set top, right, bottom, and left margins in millimeters to crop the visible area of all or selected PDF pages and remove unwanted borders.

Add Page Numbers to PDF

Add page numbers to the top or bottom of a PDF. Choose 1, Page 1, or Page 1 of 10, then set the position, font size, color, and page range.

Add a Watermark to PDF

Overlay a visible text watermark on a PDF and customize its text, position, opacity, angle, font size, color, and page range.

Rotate PDF Pages

Permanently rotate all PDF pages or selected pages by 90°, 180°, or 270° to fix sideways or upside-down scans.

PDF OCR

Add a searchable, selectable text layer to scanned PDFs. Supports Simplified and Traditional Chinese, English, and Japanese, with automatic deskewing and page rotation.

Compress PDF

Compress PDF files online with three quality levels—smallest size, balanced, and high quality. Reduce the size of scans, reports, and attachments in batches.

Image Quality Assessment

Assess objective image quality with the no-reference BRISQUE algorithm and return a score and description.

Image Advertisement Detection

Screen one image for watermarks, QR codes, barcodes, mini-program codes, and related ad signals.

Image Tamper Risk Detection

Upload one image to screen for possible editing and inspect confidence, regions, and a heatmap.

Traditional Japanese Colors & Color Palette

Explore traditional Japanese color names and values for websites, posters, presentations, and interior color schemes.

Traditional Chinese Color Palette

Explore over 500 traditional Chinese color names, hex codes, and color schemes for design, home decor, and social media content.

Solid Color Image Generator

Free online solid color image generator for any color and size, supports PNG/JPG download, perfect for placeholder images and background creation.

Letter Icon Generator

Input text to quickly generate circular or rounded square letter icons suitable for website icons, avatars, UI elements.

Placeholder Image Generator

Quickly generate custom placeholder images with specific sizes, colors, and text. Perfect for web prototyping, documentation, and frontend development.

Email Address Badge Image Generator

Create a badge image displaying an email address with optional envelope graphic and styling controls.

Scrolling Text Sign

Turn your phone or computer into a full-screen scrolling text display. Customize the message, font size, speed, background theme, and text color, or pause the animation at any time.

Online Digital Wooden Fish

Tap a realistic digital wooden fish to increase your merit count. Features authentic strike sounds, mute controls, auto-tapping, rhythm options, and fullscreen mode.

Online Tetris Game

Move and rotate falling blocks on a 10×20 board. Clear rows, preview the next piece, and play with keyboard or touch controls.

Online Snake Game: Three Difficulty Levels

Steer the snake, collect food, and avoid walls and obstacles. Choose three difficulty levels and use keyboard, swipe, or touch buttons.

Online Chinese Chess (Xiangqi)

Play Chinese chess online in local two-player or simple computer mode, with legal-move hints, undo, and restart controls.

Online 3×3 Rubik’s Cube Game

Explore six face turns on a virtual 3×3 cube, scramble the board, undo moves, and restore the cube by reversing the current move history.

Online Tangram: Freeform Shape Builder

Arrange seven tangram pieces on an open board. Drag, rotate, flip, shuffle, and reset pieces to create your own shapes.

Play Sokoban Online

Play the classic Sokoban puzzle game online with multiple levels, keyboard and touch controls, move and push tracking, unlimited undo, and instant restarts.

Online Sliding Number Puzzle

Play a sliding number puzzle online with solvable 3×3, 4×4, and 5×5 boards, move and time tracking, keyboard controls, and multi-step undo.

Online M3U8 Player

Paste an M3U8 link and play HLS video streams instantly. No plugins needed—ideal for testing live streams and previewing video segments.

Text to Speech

Turn text into natural-sounding voiceovers in seconds. Choose from multiple voices and adjust the speaking rate for videos, audiobooks, announcements, and more.

Audio Editor

Trim, join, and adjust audio right in your browser—no software installation required. Import and export popular audio formats with ease.

Screen Recorder Pro

Record your screen with camera picture-in-picture, system audio and microphone mixing, up to 4K/60fps, timed capture, and multiple recording management.

Screen Recorder

Record your computer screen online for free with no watermarks and export high-quality HD videos.

Adjust Video Volume

Precisely adjust the audio track volume of your video files with support for ±24dB lossless adjustments.

AI Video Style Transfer

AI-powered video art style transfer tool with multiple special effect filters.

Video Speed Controller

Precisely adjust video playback speed with support for 0.1x to 4x processing.

Rotate Video

Accurately adjust video orientation and fix portrait to landscape misalignment.

AI Homework Grading

Upload one K–12 homework or worksheet image to receive question-level status, reasons, and task statistics.

AI Article Rewriter

Rewrite sentences and refine wording while preserving the original meaning. Quickly create natural, human-sounding text with less repetitive phrasing.

AI Text Summarizer

Turn long articles and reports into concise summaries. AI analyzes the meaning, extracts key points and essential details, and creates a clear summary in one click.

AI Multilingual Text Translator

Enter your text and get an accurate, natural translation in seconds while preserving its context, tone, and professional style.

AI SEO Meta Tag Generator

Enter a page topic and let AI generate search-friendly title tags, meta descriptions, and keywords to improve visibility and click-through rates.

AI Weekly Work Report Generator

Enter your daily highlights and progress updates, and AI will turn them into a polished, structured weekly report ready to submit.

Image to Text Extractor

AI-powered image text recognition to extract editable text in one click.

Portrait Background Remover

Smart AI tool to separate portraits from backgrounds, generating transparent PNGs with custom size scaling support.

Image People Counter

Use AI to count the number of people in an image. Supports JPG/PNG uploads and image resizing for accurate counting results.