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.

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.

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.

TripleDES Encrypt & Decrypt

Provides TripleDES encryption and decryption features, supporting common modes like CBC/ECB and PKCS padding to protect sensitive data.

Rabbit Stream Cipher Encrypt & Decrypt Tool

Free online Rabbit stream cipher tool for fast text encryption and decryption. Supports 128-bit keys and 64-bit IVs to quickly secure sensitive data.

Xingkai Calligraphy Copybook Generator

Generate printable Xingkai pen calligraphy copybooks online. Features 3,500 common Chinese characters to boost your handwriting practice.

English Handwriting Worksheet Generator

Generate printable English vocabulary handwriting worksheets with customizable content and formatting.

Alphabet Tracing Worksheet Generator

Generate printable 26-letter alphabet tracing worksheets online to help kids and beginners practice proper handwriting.

Daily Chinese Handwriting Worksheet Generator

Free generator for 1st to 6th grade daily Chinese handwriting worksheets. Supports custom content with instant PDF downloads for printing.

Pinyin Worksheet Generator

Generate printable Pinyin practice worksheets for initials and finals to improve handwriting and stroke order.

Running Script Copybook Generator

Generate printable Chinese running script copybooks featuring 3,500 common characters to enhance your hard pen calligraphy practice.

Number Tracing Worksheet Generator

Generate free 1-10 number tracing worksheets to help kids master early writing skills.

Estimated Retirement Age Calculator

Quickly calculate your estimated retirement age and remaining working years based on your birth year and gender.

World Capital Lookup

Quickly look up the capital cities of countries worldwide. Supports bulk searching.

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.

Random Date Generator

Accurately generate random dates within a specified range, ideal for software testing and data simulation.

Costa Rica Teachers' Day: Date, History & Traditions

Find the date, origins, and traditions of Costa Rica Teachers' Day to explore local cultural customs.

El Salvador Teachers' Day: Date & Information

Look up the exact date, historical background, traditions, and significance of Teachers' Day in El Salvador with our authoritative holiday guide.

Teachers' Day in Honduras

Find the date, historical background, and celebration traditions of Teachers' Day in Honduras to understand its educational significance.

RMB Unit Converter

Free online RMB unit converter supporting mutual conversions between Yuan, Jiao, and Fen.

Personal Pension Calculator

Estimate your future retirement pension income with customizable parameters.

Rental Yield Calculator

Quickly calculate real estate rental yield and evaluate property investment value.

Test Credit Card Number Generator

Generate test credit card numbers that pass the Luhn algorithm. Supports major networks like Visa and MasterCard.

Invoice Verification

Verify VAT invoice authenticity. Enter the invoice code, number, and key details to instantly get validation results.

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 car.

Combination Mortgage Calculator

Calculate monthly payments and interest for mixed HPF and commercial mortgages, complete with detailed amortization schedules.

Year-End Bonus Tax Calculator

Accurately calculate your year-end bonus income tax. Supports both separate and comprehensive tax methods to instantly determine your after-tax income.

Freelance Income Tax Calculator

Accurately calculate personal income tax and after-tax income for freelance work. Ideal for design, consulting, and other independent contractor scenarios.

GFR Calculator

Quickly calculate Glomerular Filtration Rate (GFR) based on the CKD-EPI formula to assess kidney health.

TDEE Calculator

Calculate your Total Daily Energy Expenditure (TDEE) based on the Mifflin-St Jeor equation to get scientific calorie recommendations for fat loss and muscle gain.

Ovulation Calculator

Automatically calculate your ovulation day and fertile window based on your menstrual cycle to help you find the best time to conceive.

Fetal Gestational Age Chart

Quickly check fetal gestational age using ultrasound measurements like Crown-Rump Length (CRL) and Head Circumference (HC). Covers all trimesters to help you track fetal development.

Gestational Age Calculator

Accurately calculate fetal gestational age using your Last Menstrual Period (LMP) or ultrasound measurements (CRL, BPD, HC, FL) to estimate your due date and track fetal development.

Fetal Weight Chart by Gestational Age

A fetal weight reference tool based on NICHD Asian singleton data, helping expectant parents quickly assess their baby's growth.

Fetal Growth Chart

A fetal development reference tool based on authoritative consensus, providing standard ranges for key parameters like BPD and head circumference by gestational week.

Daily Water Intake Calculator

Scientifically calculate your daily water needs based on weight and activity level to create a personalized hydration plan and maintain optimal water balance.

Maximum Heart Rate (MHR) Calculator

Calculate your maximum heart rate using multiple scientific formulas to help fitness enthusiasts create effective training plans and identify safe target heart rate zones.

2FA Code Generator & Validator

Generate and verify two-factor authentication (2FA) codes online to secure your accounts.

ID Card Face Match Verification

Verify if an ID card photo and a real-life photo belong to the same person using AI facial recognition technology.

IPv6 Location Lookup

Accurately find the geolocation of any IPv6 address, including country, city, and ISP details.

IP Risk Profile Checker

Check the security risk profile of an IP address, including key threat intelligence like threat types, reputation scores, and geolocation.

Street-Level IP Address Geolocation Tool

Accurately look up the street-level location and ISP details of an IP address. Supports both IPv4 and IPv6 parsing.

TTFB Test Tool

Measure your server's Time to First Byte (TTFB) to help developers optimize website performance and SEO rankings.

HSTS Checker

Check your website's HSTS configuration status, analyze security header parameters, and enhance HTTPS strict transport security.

HTTP Header Checker

Online tool to parse HTTP request and response headers for websites or APIs, helping developers debug and optimize network communications.

IPv6 Test Tool

Check IPv6 support for your network or website and get detailed connectivity and DNS resolution diagnostic reports.

Subtraction Chart Generator (Up to 10)

Quickly generate a subtraction chart up to 10. Supports printing and PDF downloads.

Voltage Unit Converter

Quickly convert voltage units like volts, millivolts, and kilovolts online with support for batch calculations.

Addition Table Up to 10

Provides an addition table up to 10 in image format, available for printable download.

Printable Multiplication Table

Generate and download a free high-resolution 1-9 multiplication table chart for easy printing.

Math Facts Generator

Automatically generate elementary math practice problems for addition, subtraction, multiplication, and division. Supports mixed calculations up to 10, 20, and 100.

Torque Unit Converter

Quickly and accurately convert between different torque units, including common units like Newton-meters and foot-pounds.

Resistor, Capacitor & Inductor Unit Converter

Online unit conversion tool for resistors, capacitors, and inductors.

Illuminance Unit Converter

Quickly convert illuminance units including lux (lx), foot-candles (fc), and phots (ph).

Current Unit Converter

Quickly and accurately convert current units like amps and milliamps.

Cron Expression Generator

Generate Cron expressions online and visually configure scheduled tasks.

Blank Code Generator

Quickly generate blank code templates and placeholders for various programming languages.

Mermaid Chart Generator

Generate Mermaid chart code online. Supports multiple types including flowcharts and sequence diagrams.

UUID Format Converter & Validator

Professionally handle UUID format conversions and validity checks. Supports multiple formats including standard, pure hex, and URN.

JSON Data Generator

Quickly generate structured test data using template syntax. Supports JSON, XML, and CSV formats.

Shannon Entropy Calculator

Calculate the information entropy of text or data sequences to evaluate uncertainty and randomness.

Random JSON Data Generator

Generate random JSON mock data based on template structures for development and testing.

Random Hex Generator

Generate random hex strings of any specified length on demand. Perfect for development testing, unique identifiers, and more.

Random File Generator

Generate random files of any size and format on demand, including text and binary data formats.

Blank Pinyin Practice Sheet Generator

Free Pinyin practice sheet generator. Create custom printable Tianzige writing templates in one click.

Clerical Script Copybook Generator

Generate free printable Clerical Script (Lishu) calligraphy copybooks in PDF format for 3,500 common Chinese characters.

Regular Script Practice Sheet Generator

Generate free, printable regular script practice sheets with customizable text and grid formats.

Custom Grid Generator

Generate custom, pixel-perfect grids with adjustable rows, columns, line styles, and colors.

Chinese Calligraphy Grid Generator

Generate custom Chinese calligraphy grid paper to improve your handwriting and master character strokes.

Chinese Writing Grid Generator

Generate custom Tianzi grid practice paper to standardize Chinese character writing structure.

Text Length Filter

Quickly filter text by character count range and clean up sentences or paragraphs that don't meet your length requirements.

Text Case Converter

Instantly convert text case with one click. Supports four modes: uppercase, lowercase, title case, and sentence case.

Lorem Ipsum Generator

Quickly generate Latin placeholder text for design and typography. Supports paragraphs, sentences, and words.

Text to Image Card Generator

Quickly convert text into beautiful image cards with customizable styles.

Image Compressor

Compress image size online with proportional resizing and optimize image quality.

Dead Pixel Test

Check your screen for dead, stuck, and bright pixels online to quickly evaluate monitor quality.

Text to PDF Converter

Convert plain text into standard PDF documents. Perfect for archiving, printing, and sharing.

ODF to PDF Converter

Convert open documents like ODT, ODS, and ODP to PDF online. Preserve original formatting for easy sharing and printing.

PPT to PDF Converter

Convert PowerPoint slides into high-fidelity PDF documents. Maintain original formatting and visual consistency for business and academic use.

Excel to PDF

Convert Excel spreadsheets to PDF documents online while preserving the original formatting and layout. Ideal for sharing reports and archiving.

Word to PDF Converter

Convert Word documents (DOC/DOCX) to high-quality PDFs while preserving the original formatting. Perfect for document archiving and sharing.

Sign PDF with Certificate

Add legally binding digital signatures to PDFs to ensure document authenticity and integrity.

Group Ship Name Generator

Automatically generate creative group ship names and character pairings effortlessly.

Acrostic Poem Generator

Generate acrostic or telestich poems in one click. Supports custom text and poetry styles.

Sudoku Game

Play Sudoku online with multiple difficulty levels and real-time hints to boost your logical thinking.

Text to ASCII Art Generator

Convert plain text into visual ASCII art. Perfect for code comments, social media, and more.

Gamepad Tester

Test your gamepad buttons, joysticks, triggers, and vibration online. Quickly diagnose controller performance issues.

Chinese Kinship Calculator

Parse complex family relationship chains and generate accurate Chinese kinship titles in one click to solve family naming dilemmas.

MBTI Career Personality Test (93 Questions)

A professional 93-question assessment based on MBTI theory that analyzes your personality type and career strengths, offering personalized development advice.

Big Five Personality Test (25 Questions)

A 25-question personality test based on the OCEAN model. Quickly assess the Big Five traits and get a detailed personality analysis report.

Big Five Personality Test (60 Questions)

A 60-question personality assessment based on the OCEAN model. Get a detailed 5-dimension personality report to boost self-awareness and personal growth.

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.

Reverse Video Tool

Precise frame-level video reverser supporting multiple formats and audio retention.

Mute Video Tool

Professionally remove audio tracks from videos to create silent videos.

Video Merger

Merge multiple video clips into a single video while keeping the original quality.

Video Frame Extractor

Accurately extract keyframes or capture still images at specific timestamps from your videos. Supports multiple export formats.

Flip Video

Online tool to mirror and flip videos. Supports MP4, MOV, and other major formats with lossless processing.