Explore Tool Categories

Online HTML preview tool for testing front-end code. Copy your HTML, CSS, or JavaScript code into the editor and see real-time results in the preview pane.

UUID Generator

Generate unique identifiers (UUID/GUID) instantly. Support for UUID v1 (time-based), v3 (MD5), v4 (random), and v5 (SHA-1) with bulk generation.

HTML Color Code Reference

Complete HTML color code reference with HEX, RGB, HSL values. Browse web-safe colors, named colors, and copy codes instantly for web development.

FontAwesome Icon Library

Complete FontAwesome icon reference with search, preview, and copy functionality. Browse thousands of free icons for web development and design projects.

Lucide Icon Library

Complete Lucide icon reference with search, preview, and copy functionality. Browse beautiful open-source icons for modern web development and design projects.

ASCII Keycode Reference

Complete ASCII and keyboard keycode reference table. Find character codes, key codes, and special key values for web development and programming.

MIME Type Reference

Complete MIME type and file extension reference. Find correct MIME types for file uploads, HTTP headers, and content type declarations.

Common Spider User Agents

Complete reference of common web crawler and spider user agent strings. Identify search engine bots, scrapers, and automated tools accessing your website.

Random Password Generator

Generate strong, secure random passwords with customizable length and character types. Support bulk generation and password strength analysis.

Pomodoro Timer

A simple and effective Pomodoro timer to boost your productivity. Use the Pomodoro Technique to break work into focused 25-minute intervals with short breaks.

Random Name Picker

Randomly select names from a list for classroom roll calls, team assignments, lucky draws, and fair decision making. Support for weighted selection and history tracking.

Short URL Expander

Expand shortened URLs to reveal the actual destination. Check where short links lead before clicking for security and transparency.

Number List Sum Calculator

Fast batch number calculator for sum, average, min, max, count, and median. Paste any list of numbers and get instant statistical analysis. No spreadsheet needed - perfect for quick calculations.

Chinese Amount Uppercase Converter

Convert numbers to Chinese uppercase amount format (大写金额). Essential tool for financial documents, invoices, checks, and contracts in Chinese business contexts to prevent fraud and alteration.

CSV Chinese Encoding Fixer

Fix garbled Chinese characters in CSV files instantly. Resolve UTF-8, GBK, GB2312 encoding issues when opening CSV in Excel. Convert messy text to readable Chinese in seconds.

Excel Phone Number Extractor - Extract Mobile Numbers from Spreadsheets

Extract Chinese mobile phone numbers from Excel files instantly. Auto-detect carrier (China Mobile, Unicom, Telecom), format numbers, and export to CSV/TXT. Perfect for contact list cleaning and CRM data processing.

Excel Link Extractor - Batch Extract URLs & Hyperlinks

Extract all URLs, hyperlinks, and email addresses from Excel files instantly. Batch extract links from .xlsx, .xls, CSV files with cell location tracking. Perfect for SEO audits and data migration.

Free Online CSV Viewer - View & Analyze CSV Files Instantly

Free online CSV viewer to open, view and analyze CSV files in browser. No installation needed. Support large files, search, filter, sort and export. Paste CSV data or upload files. 100% secure and private.

Body Fat Calculator

Calculate your body fat percentage using US Navy method. Track your fitness progress with accurate body composition analysis.

Pregnancy Due Date Calculator

Free online pregnancy calculator to estimate your due date and track pregnancy milestones. Calculate based on last menstrual period (LMP) or conception date with accurate trimester breakdown and weekly pregnancy timeline.

Ovulation & Safe Period Calculator

Free ovulation calculator and fertility tracker to predict your most fertile days, ovulation date, and safe period. Perfect for family planning, conception tracking, and understanding your menstrual cycle with accurate fertility window predictions.

Child Height Predictor

Free child height calculator to predict your child's adult height based on parents' heights. Get accurate height predictions using the mid-parental height method with scientifically validated formulas. Includes height range estimates and growth insights.

Daily Water Intake Calculator

Free water intake calculator to determine your personalized daily hydration needs based on weight, activity level, climate, and health conditions. Get accurate water consumption recommendations in liters, glasses, and bottles to stay properly hydrated.

Mortgage Calculator

Calculate monthly mortgage payments, total interest, and amortization schedule. Compare different loan terms and interest rates for home financing.

Compound Interest Calculator

Calculate compound interest growth for investments and savings. See how your money grows over time with regular contributions and compound returns.

Emoji Encyclopedia

Complete emoji reference guide with all Unicode emojis. Browse, search, and copy emojis by category including smileys, animals, food, activities, and more.

Country Code Reference

Complete reference guide for global country codes including ISO codes, phone codes, currency codes, and capital cities. Search and browse country information instantly.

Official Languages by Country

Complete reference of official languages spoken in countries worldwide. Search and browse languages by country, language family, and region.

I Ching 64 Hexagrams Reference

Complete reference guide for the 64 hexagrams of I Ching (Book of Changes). Browse hexagram meanings, interpretations, and traditional Chinese wisdom.

China License Plate Codes

Complete reference for Chinese vehicle license plate codes and their corresponding provinces and cities. Quick lookup for license plate abbreviations.

Browser User Agents Reference

Complete collection of common browser User-Agent strings for Chrome, Firefox, Safari, Edge, and mobile browsers. Essential for web development and testing.

Public DNS Servers

Complete list of public DNS server IP addresses from Google, Cloudflare, OpenDNS, Quad9 and more. Fast DNS lookup for better internet performance and security.

International Phone Codes

Complete reference of international dialing codes for all countries. Quick lookup for country calling codes and phone number formats worldwide.

Currency Codes Reference

Complete ISO 4217 currency codes for all countries. Quick lookup for currency symbols, names, and numeric codes worldwide.

Locale Codes Reference

Complete reference of locale codes (language-region) for internationalization. Essential for i18n, l10n, and multilingual applications.

Domain Suffix List

Complete list of top-level domains (TLDs) including generic, country-code, and new gTLDs. Essential reference for domain registration and DNS management.

China Provinces & Abbreviations

Complete reference of Chinese provinces, municipalities, and autonomous regions with their abbreviations. Essential for understanding Chinese administrative divisions.

Periodic Table of Elements

Interactive periodic table with detailed information about all chemical elements. Search, browse, and explore element properties, atomic structure, and chemical data.

World Capitals Reference

Complete reference guide of world capitals with search functionality. Find capital cities for all countries, including population, timezone, and geographic information.

Blood Type Genetics Calculator

Calculate possible blood types of children based on parents blood types. Learn about ABO and Rh blood type inheritance patterns, genetic compatibility, and Mendelian genetics principles.

Chinese Sexagenary Cycle (Sixty Jiazi)

Complete reference of the 60-year Chinese Sexagenary Cycle with Heavenly Stems and Earthly Branches. Search and explore all 60 Jiazi combinations used in Chinese calendar, astrology, and traditional timekeeping.

Telephone Area Code Reference

Complete reference of telephone area codes for landlines worldwide. Search and browse area codes by country, region, or city for accurate dialing and phone number verification.

Font License Checker

Check font copyright and licensing information. Search popular fonts and their usage rights for commercial and personal projects.

World Clock

View current time in major cities worldwide. Compare time zones, schedule international meetings, and convert times across different regions.

ID Card Birthday Extractor

Extract birthday information from Chinese ID card numbers. Quickly parse date of birth, age, zodiac sign, and constellation from 15 or 18-digit ID numbers with validation.

English Name Generator

Generate random English names with first and last names. Perfect for testing, creative writing, character creation, and placeholder data with customizable gender options.

Chinese Name Generator

Generate random Chinese names with authentic surnames and given names. Perfect for testing, creative writing, character creation, and placeholder data with customizable gender options.

Phone Number Extractor

Intelligently extract and validate phone numbers from any text. Automatically detect and extract Chinese mobile numbers, landline numbers with area codes, and international phone numbers from documents, emails, web pages, or any text content. Features include format validation, duplicate removal, and batch export.

Random Number Generator

Generate cryptographically secure random numbers with customizable range, quantity, and sorting options. Perfect for lottery draws, games, statistical sampling, testing, password generation, and any scenario requiring truly random number generation with guaranteed fairness.

IP Address Extractor

Extract and validate IP addresses from text with intelligent parsing. Automatically detect, extract, and validate IPv4 and IPv6 addresses from logs, documents, network data, or any text content. Features include duplicate removal, format validation, and batch export.

Chinese Character Stroke Counter

Count strokes in Chinese characters with interactive stroke order animation and writing practice. Perfect for learning Chinese, calligraphy, dictionary lookup, and understanding character structure and complexity.

Random Length Text List Generator

Generate random text strings with customizable length and quantity instantly. Perfect for testing applications, creating placeholder data, mock content generation, UI testing, and database seeding.

URL Link Batch Generator

Generate multiple URLs with sequential numbering and customizable patterns instantly. Perfect for creating test URLs, generating link lists, batch URL creation, SEO testing, and web scraping preparation.

Character Counter

Count characters, words, lines, sentences, and paragraphs in text instantly. Real-time statistics for content writing, social media posts, SEO optimization, and document analysis with comprehensive metrics.

Regular Expression Tester

Test and debug regular expressions with real-time matching and visualization. See regex matches, capture groups, and flags with syntax highlighting and detailed match information for pattern development and debugging.

Remove Empty Lines

Remove empty lines and blank lines from text instantly. Clean up text by removing unnecessary line breaks, whitespace-only lines, and extra spacing with one click for cleaner, more compact content.

URL Link Extractor

Extract and list all URLs from text instantly. Automatically detect web links with HTTP/HTTPS/FTP protocols, domain names, and various URL formats from documents, emails, or any text content with automatic deduplication.

String Splitter

Split text by custom delimiter into separate lines or array instantly. Customize separator, trim whitespace, remove empty entries, and process CSV data, lists, or any delimited text with flexible options.

Underscore & Camel Case Converter

Convert between snake_case, camelCase, PascalCase, kebab-case, and CONSTANT_CASE instantly. Perfect for code refactoring, variable naming, API response conversion, and standardizing naming conventions across different programming languages.

Chinese-English Punctuation Converter

Convert between Chinese full-width and English half-width punctuation marks instantly. Transform commas, periods, quotes, brackets, and more for proper text formatting, fixing copy-paste issues, and standardizing mixed-language content.

Simplified-Traditional Chinese Converter

Convert between Simplified and Traditional Chinese characters instantly. Professional bidirectional conversion using OpenCC for text localization, translation, cross-region content adaptation, and multilingual publishing.

Text Duplicate Detector

Find and remove duplicate lines in text instantly. Detect repeated content, clean data lists, identify unique entries with detailed statistics. Perfect for data cleaning, email lists, and content deduplication.

Microphone Test - Test Your Mic Online

Test your microphone online instantly. Check if your mic is working, view real-time audio levels, and troubleshoot microphone issues. Works with all devices and browsers.

Screen Test - Test Monitor Display Online

Test your screen and monitor display online. Check for dead pixels, color accuracy, brightness uniformity, and screen defects. Works on all devices - PC, laptop, phone, tablet.

Camera Test - Test Webcam Online

Test your webcam and camera online instantly. Check if your camera is working, preview video quality, adjust settings, and troubleshoot camera issues. Works on all devices.

Mouse Test - Test Mouse Buttons, Scroll Wheel & Cursor Online

Free online mouse tester to check all mouse buttons (left, right, middle, side buttons), scroll wheel, cursor movement, and double-click speed. Instantly diagnose mouse problems on any device without installation.

Keyboard Test - Test Keyboard Keys Online

Test your keyboard keys online instantly. Check if all keys are working properly including letters, numbers, function keys, and special keys. Works on all devices.

Keyboard KeyCode Viewer - JavaScript Key Event Inspector

Interactive JavaScript keyboard event inspector. Press any key to instantly view keyCode, key, code, which, charCode, and modifier states. Essential debugging tool for web developers building keyboard shortcuts and event handlers.

QR Code Generator

Generate custom QR codes online for free. Support text, URL, WiFi, contact info with customizable colors, sizes, and logo embedding.

Barcode Generator

Generate various types of barcodes online for free. Support EAN-13, UPC, Code128, Code39 and more with customizable size and format.

Screen Color Picker

Pick colors from anywhere on your screen with eyedropper tool. Get HEX, RGB, HSL color codes instantly for design and development.

File Compressor & Archive

Compress and archive multiple files into ZIP format online. Reduce file size, create archives, and download compressed files instantly.

File MD5 Calculator

Calculate MD5, SHA-1, SHA-256 hash values for files online. Verify file integrity, check checksums, and ensure file authenticity instantly.

Image Format Converter

Convert images between formats online - JPG, PNG, WebP, GIF, BMP. Fast, free image conversion with quality control and batch processing.

Text to Speech - Convert Text to Natural Voice Audio Online

Free online text to speech converter. Transform written text into natural-sounding speech with multiple voices, languages, and adjustable speed. Perfect for accessibility, learning, and content creation.

Audio Player - Play MP3, WAV, OGG & More Audio Formats Online

Free online audio player supporting MP3, WAV, OGG, FLAC, AAC and more formats. Play audio files with playback controls, speed adjustment, and volume control. No installation required.

Video Player - Play MP4, WebM, AVI & More Video Formats Online

Free online video player supporting MP4, WebM, AVI, MOV and more formats. Play videos with full controls, speed adjustment, and quality settings. No installation required.

Fraction Simplifier Calculator

Simplify fractions to lowest terms instantly. Reduce any fraction to its simplest form with step-by-step explanation. Perfect for students, teachers, and math enthusiasts.

Geometric Series Sum Calculator

Calculate the sum of geometric sequences instantly. Find the sum of finite or infinite geometric series with step-by-step solutions. Perfect for students and math professionals.

Greatest Common Divisor (GCD) Calculator

Calculate the GCD of multiple numbers instantly. Find the greatest common divisor using Euclidean algorithm with step-by-step explanation. Perfect for fraction simplification and number theory.

Arithmetic Series Sum Calculator

Calculate the sum of arithmetic sequences instantly. Find the sum of arithmetic series with step-by-step solutions. Perfect for students learning sequences and series.

Arithmetic Sequence Generator

Generate arithmetic sequences with custom parameters. Create any arithmetic progression by specifying first term, common difference, and number of terms. Perfect for math education and pattern analysis.

Least Common Multiple (LCM) Calculator

Calculate the LCM of multiple numbers instantly. Find the least common multiple using prime factorization with step-by-step explanation. Perfect for fraction operations and scheduling problems.

List Permutations Generator

Generate all permutations of a list instantly. Create every possible arrangement of items with detailed count and export options. Perfect for combinatorics, scheduling, and problem-solving.

List Combinations Generator

Generate all combinations of a list instantly. Create every possible selection of items regardless of order. Perfect for combinatorics, team selection, and probability problems.

TI-84 Calculator Online

Free online TI-84 Plus CE graphing calculator simulator with zoom and fullscreen support. Perform advanced math calculations, plot graphs, solve equations, and use statistical functions just like the real TI-84 Plus calculator.

Phone to VCF Converter - Batch Import Contacts to Address Book

Convert phone numbers to VCF (vCard) format for batch importing contacts. Support name assignment, carrier detection, and multiple export options. Perfect for CRM, marketing campaigns, and contact management.