Explore Tool Categories
Browse our collection of tools organized by category. Click any tag to explore tools in that category.
12 categories • 97 tools available
Free Online HTML Editor & Live Preview
Free online HTML editor with live preview. Write and test HTML, CSS, JavaScript code in real-time. No signup required - instant results, auto-save, and works offline.
Free Online UUID Generator (GUID)
Free online UUID/GUID generator. Generate UUID v1, v3, v4, v5 instantly with bulk generation. Copy with one click. No signup required - 100% free, private, and works offline.
Free HTML Color Code Reference & Picker
Free online HTML color code reference with HEX, RGB, HSL values. Browse 140+ web colors, copy codes instantly. No signup - 100% free for web developers.
Free FontAwesome Icon Library & Search
Free online FontAwesome icon library with search, preview, and copy. Browse thousands of free icons for web development. No signup - 100% free, instant copy.
Free Lucide Icon Library & Search
Free online Lucide icon library with search, preview, and copy. Browse beautiful open-source icons for React, Vue, and web projects. No signup - 100% free.
Free ASCII & Keycode Reference Table
Free online ASCII code and keyboard keycode reference. Find character codes, JavaScript key codes, and event values instantly. No signup - 100% free for developers.
Free MIME Type Reference & Lookup
Free online MIME type and file extension reference. Find correct MIME types for file uploads, HTTP headers instantly. No signup - 100% free for developers.
Free Spider & Bot User Agent Reference
Free online spider and crawler user agent reference. Find Googlebot, Bingbot, and all major search engine bot user agents. No signup - 100% free for developers.
Free Strong Password Generator Online
Free online password generator. Create strong, secure random passwords instantly. Customize length, characters, bulk generate. No signup - 100% free, private, works offline.
Free Online JSON Formatter & Validator
Free online JSON formatter, validator, and beautifier. Format, minify, and validate JSON instantly with syntax highlighting. No signup required - 100% free, private, and works offline.
Free Online Base64 Encoder & Decoder
Free online Base64 encoder and decoder. Convert text to Base64 and decode Base64 to text instantly. Supports UTF-8, URL-safe encoding. No signup - 100% free and private.
Free Online XML Formatter & Validator
Free online XML formatter, validator, and beautifier. Format, minify, and validate XML instantly with syntax highlighting. No signup - 100% free, private, works offline.
Free Online URL Parameters Parser & Formatter
Free online URL parameter parser and formatter. Parse, decode, and analyze query strings instantly. No signup - 100% free, private, works offline for API development.
Free Online Pomodoro Timer
Free online Pomodoro timer to boost your productivity. No signup required - 100% free, private, and works offline. Use the Pomodoro Technique with customizable 25-minute focused work intervals.
Free Online Random Name Picker
Free online random name picker for classroom roll calls, team assignments, and lucky draws. No signup required - 100% free, private, and works offline. Fair selection with history tracking.
Free Online Short URL Expander
Free online short URL expander to reveal actual destinations. No signup required - 100% free and private. Check where bit.ly, tinyurl, and other short links lead before clicking for security.
Free Online Number Sum Calculator
Free online number sum calculator for batch calculations. No signup required - 100% free, private, and works offline. Get sum, average, min, max, count, and median instantly.
Free Online Chinese Amount Uppercase Converter
Free online Chinese amount uppercase converter (大写金额). No signup required - 100% free, private, and works offline. Essential for invoices, checks, and contracts in Chinese business.
Free Online CSV Chinese Encoding Fixer
Free online CSV encoding fixer for Chinese characters. No signup required - 100% free, private, and works offline. Fix garbled text (乱码) when opening CSV in Excel. Convert UTF-8, GBK, GB2312 instantly.
Free Online Excel Phone Number Extractor
Free online Excel phone number extractor for Chinese mobile numbers. No signup required - 100% free, private, and works offline. Auto-detect carrier, format numbers, and export to CSV/TXT.
Free Online Excel Link Extractor
Free online Excel link extractor to batch extract URLs and hyperlinks. No signup required - 100% free, private, and works offline. Extract all URLs, hyperlinks, and emails from .xlsx, .xls, CSV files.
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.
Free Online Body Fat Calculator - US Navy Method
Free online body fat calculator using the US Navy method. Calculate body fat percentage, lean mass, and fat mass instantly. No signup - 100% free, accurate, and private.
Free Online Pregnancy Due Date Calculator
Free online pregnancy due date calculator. Calculate your due date and track pregnancy milestones based on LMP or conception date. No signup - 100% free and private.
Free Online Ovulation & Safe Period Calculator
Free online ovulation calculator and fertility tracker to predict your most fertile days, ovulation date, and safe period. No signup required. Perfect for family planning and conception tracking. 100% free, private, and works offline.
Free Online Child Height Predictor Calculator
Free online child height calculator to predict your child's adult height based on parents' heights. No signup required. Get accurate height predictions using the mid-parental height method with scientifically validated formulas. 100% free, private, and works offline.
Free Online Daily Water Intake Calculator
Free online water intake calculator. Calculate your personalized daily hydration needs based on weight, activity, and climate. No signup - 100% free and private.
Free Online Mortgage Calculator
Free online mortgage calculator. Calculate monthly payments, total interest, and amortization schedule instantly. No signup - 100% free and private for home buyers.
Free Online Compound Interest Calculator
Free online compound interest calculator. Calculate investment growth with regular contributions and compound returns. No signup - 100% free and private.
Free Online Emoji Encyclopedia & Search
Free online emoji reference guide with all Unicode emojis. Browse, search, and copy emojis by category instantly. No signup required. 100% free, works offline, and includes smileys, animals, food, activities, and more.
Free Online Country Code Reference
Free online reference guide for global country codes including ISO codes, phone codes, currency codes, and capital cities. No signup required. Search and browse country information instantly. 100% free and works offline.
Free Online Official Languages by Country
Free online reference of official languages spoken in countries worldwide. No signup required. Search and browse languages by country, language family, and region. 100% free and works offline.
Free Online I Ching 64 Hexagrams Reference
Free online reference guide for the 64 hexagrams of I Ching (Book of Changes). No signup required. Browse hexagram meanings, interpretations, and traditional Chinese wisdom. 100% free and works offline.
Free Online China License Plate Codes
Free online reference for Chinese vehicle license plate codes and their corresponding provinces and cities. No signup required. Quick lookup for license plate abbreviations. 100% free and works offline.
Free Online Browser User Agents Reference
Free online collection of common browser User-Agent strings for Chrome, Firefox, Safari, Edge, and mobile browsers. No signup required. Essential for web development and testing. 100% free and works offline.
Free Online Public DNS Servers List
Free online list of public DNS server IP addresses from Google, Cloudflare, OpenDNS, Quad9 and more. No signup required. Fast DNS lookup for better internet performance and security. 100% free and works offline.
Free Online International Phone Codes
Free online reference of international dialing codes for all countries. No signup required. Quick lookup for country calling codes and phone number formats worldwide. 100% free and works offline.
Free Online Currency Codes Reference
Free online ISO 4217 currency codes for all countries. No signup required. Quick lookup for currency symbols, names, and numeric codes worldwide. 100% free and works offline.
Free Online Locale Codes Reference
Free online reference of locale codes (language-region) for internationalization. No signup required. Essential for i18n, l10n, and multilingual applications. 100% free and works offline.
Free Online Domain Suffix List
Free online list of top-level domains (TLDs) including generic, country-code, and new gTLDs. No signup required. Essential reference for domain registration and DNS management. 100% free and works offline.
Free Online China Provinces & Abbreviations
Free online reference of Chinese provinces, municipalities, and autonomous regions with their abbreviations. No signup required. Essential for understanding Chinese administrative divisions. 100% free and works offline.
Free Online Periodic Table of Elements
Free online interactive periodic table with detailed information about all 118 chemical elements. No signup required. Search, browse, and explore element properties, atomic structure, and chemical data. 100% free and works offline.
Free Online World Capitals Reference
Free online reference guide of world capitals with search functionality. No signup required. Find capital cities for all countries, including population, timezone, and geographic information. 100% free and works offline.
Free Online Blood Type Genetics Calculator
Free online calculator to predict possible blood types of children based on parents blood types. No signup required. Learn about ABO and Rh blood type inheritance patterns and Mendelian genetics principles. 100% free, private, and works offline.
Free Online Chinese Sexagenary Cycle (Sixty Jiazi)
Free online reference of the 60-year Chinese Sexagenary Cycle with Heavenly Stems and Earthly Branches. No signup required. Search and explore all 60 Jiazi combinations used in Chinese calendar and astrology. 100% free and works offline.
Free Online Telephone Area Code Reference
Free online reference of telephone area codes for landlines worldwide. No signup required. Search and browse area codes by country, region, or city for accurate dialing and phone number verification. 100% free and works offline.
Free Online Font License Checker
Free online tool to check font copyright and licensing information. No signup required. Search popular fonts and their usage rights for commercial and personal projects. 100% free and works offline.
Free Online World Clock
Free online world clock to view current time in major cities worldwide. No signup required. Compare time zones, schedule international meetings, and convert times across different regions. 100% free and works offline.
Free Online ID Card Birthday Extractor
Free online tool to extract birthday information from Chinese ID card numbers. No signup required. Quickly parse date of birth, age, zodiac sign, and constellation from 15 or 18-digit ID numbers with validation. 100% free, private, and works offline.
Free Online English Name Generator
Free online tool to generate random English names with first and last names. No signup required. Perfect for testing, creative writing, character creation, and placeholder data with customizable gender options. 100% free, private, and works offline.
Free Online Chinese Name Generator
Free online tool to generate random Chinese names with authentic surnames and given names. No signup required. Perfect for testing, creative writing, character creation, and placeholder data with customizable gender options. 100% free, private, and works offline.
Free Online Phone Number Extractor
Free online tool to intelligently extract and validate phone numbers from any text. No signup required. Automatically detect and extract Chinese mobile numbers, landline numbers, and international phone numbers. 100% free, private, and works offline.
Free Online Random Number Generator
Free online cryptographically secure random number generator with customizable range, quantity, and sorting options. No signup required. Perfect for lottery draws, games, statistical sampling, and testing. 100% free, private, and works offline.
Free Online IP Address Extractor
Free online tool to extract and validate IP addresses from text with intelligent parsing. No signup required. Automatically detect, extract, and validate IPv4 and IPv6 addresses from logs, documents, or any text content. 100% free, private, and works offline.
Free Online Chinese Character Stroke Counter
Free online Chinese character stroke counter with interactive stroke order animation and writing practice. No signup required - 100% free, private, and works offline. Perfect for learning Chinese, calligraphy, and dictionary lookup.
Free Online Random Text Generator
Free online random text generator with customizable length and quantity. No signup required - 100% free, private, and works offline. Perfect for testing applications, placeholder data, mock content, and database seeding.
Free Online URL Batch Generator
Free online URL batch generator with sequential numbering and customizable patterns. No signup required - 100% free, private, and works offline. Perfect for test URLs, SEO testing, and web scraping preparation.
Free Online Character & Word Counter
Free online character counter and word counter. Count characters, words, sentences, paragraphs instantly. Perfect for Twitter, SEO, essays. No signup - 100% free and private.
Free Online Regex Tester & Debugger
Free online regex tester and debugger. Test regular expressions with real-time matching, syntax highlighting, and capture groups. No signup - 100% free and private.
Free Online Empty Line Remover
Free online empty line remover. Remove blank lines and whitespace-only lines instantly. No signup - 100% free, private, perfect for text cleanup and code formatting.
Free Online URL Extractor - Extract Links from Text
Free online URL extractor tool. Extract and list all URLs from text instantly with automatic deduplication. No signup required - 100% free, private, and works offline. Supports HTTP/HTTPS/FTP protocols.
Free Online String Splitter - Split Text by Delimiter
Free online string splitter tool. Split text by custom delimiter into separate lines or array instantly. No signup required - 100% free, private, and works offline. Process CSV data, lists, or any delimited text.
Free Case Converter - camelCase, snake_case, PascalCase
Free online case converter. Convert between camelCase, snake_case, PascalCase, kebab-case, CONSTANT_CASE instantly. No signup - 100% free for developers.
Free Online Punctuation Converter - Chinese & English
Free online Chinese-English punctuation converter. Convert between full-width and half-width punctuation marks instantly. No signup required - 100% free, private, and works offline.
Free Online Chinese Converter - Simplified & Traditional
Free online Simplified-Traditional Chinese converter. Convert between Simplified and Traditional Chinese characters instantly using OpenCC. No signup required - 100% free, private, and works offline.
Free Online Duplicate Line Detector & Remover
Free online duplicate line detector and remover. Find and remove duplicate lines instantly. No signup - 100% free, private, perfect for data cleaning and email lists.
Free Online Font Preview Tool - Compare Fonts Instantly
Free online font preview and comparison tool. Preview and compare fonts with custom text instantly. No signup required - 100% free, private, and works offline. Perfect for typography design and font selection.
Free Online Microphone Test - Test Your Mic Instantly
Free online microphone test tool. Check if your mic is working, view real-time audio levels, and troubleshoot mic issues instantly. No signup required - 100% free, private, and works offline on all devices.
Free Online Screen Test - Dead Pixel & Display Test
Free online screen and monitor test tool. Check for dead pixels, color accuracy, brightness uniformity, and screen defects instantly. No signup required - 100% free, private, and works offline on all devices.
Free Online Camera Test - Test Webcam Instantly
Free online webcam test tool. Check if your camera is working, preview video quality, and troubleshoot camera issues instantly. No signup required - 100% free, private, and works offline on all devices.
Free Online Mouse Test - Test Buttons, Scroll & Cursor Instantly
Free online mouse tester to check all mouse buttons (left, right, middle, side buttons), scroll wheel, cursor movement, and double-click speed. No signup required - 100% free, private, and works offline. Instantly diagnose mouse problems on any device.
Free Online Keyboard Test - Test All Keys Instantly
Free online keyboard tester. Check if all keys are working properly including letters, numbers, function keys, and special keys. No signup required - 100% free, private, and works offline on all devices.
Free Online KeyCode Viewer - JavaScript Key Event Inspector
Free online JavaScript keyboard event inspector. Press any key to instantly view keyCode, key, code, which, charCode, and modifier states. No signup required - 100% free, private, and works offline. Essential debugging tool for web developers.
Free Online Altitude Calculator - Real-time GPS Elevation
Free online altitude calculator with real-time GPS. Check your current altitude and elevation instantly - shows height above sea level, coordinates, and accuracy. No signup required - 100% free, private, and works on all devices.
Free QR Code Generator Online
Free online QR code generator. Create custom QR codes for URLs, WiFi, text, contacts with logo. Download PNG, SVG. No signup - 100% free, unlimited, no watermark.
Free Online Barcode Generator
Free online barcode generator. Create EAN-13, UPC, Code128, Code39 barcodes instantly. No signup - 100% free, no watermark, unlimited generations.
Free Online Screen Color Picker - Eyedropper Tool
Free online screen color picker with eyedropper tool. Pick colors from anywhere on your screen and get HEX, RGB, HSL codes instantly. No signup required - 100% free, private, and works offline.
Free Online Image to Base64 Converter
Free online image to Base64 converter. Convert images to Base64 and Base64 to images instantly. No signup required - 100% free, private, and works offline. Perfect for HTML/CSS embedding and data URIs.
Free Online Image to Perler Beads Converter
Free online image to Perler beads pattern converter. Convert any image into bead patterns with Perler, Hama, Artkal color palettes. No signup required - 100% free, private, with real-time editing and bead counting.
Free Online Photo Book Maker - Create Albums Instantly
Free online photo book maker. Create stunning photo albums in minutes with drag & drop editing. No signup required - 100% free, private, export print-ready PDF.
Free Online File Compressor & ZIP Archive Creator
Free online file compressor to create ZIP archives instantly. No signup required, 100% free. Compress multiple files, reduce file size, and download compressed files. Works offline, completely private.
Free Online File MD5 & Hash Calculator
Free online file hash calculator for MD5, SHA-1, SHA-256, SHA-512. No signup required, 100% free. Verify file integrity, check checksums instantly. Works offline, completely private.
Free Online Image Format Converter - JPG PNG WebP
Free online image format converter for JPG, PNG, WebP, GIF, BMP. No signup required, 100% free. Fast image conversion with quality control and batch processing. Works offline, completely private.
Free Online JSON to CSV Converter
Free online JSON to CSV converter. No signup required, 100% free. Transform JSON arrays and objects into CSV files instantly with customizable delimiters. Works offline, completely private.
Free Online Text to Speech Converter - Natural Voice Generator
Free online text to speech converter. No signup required, 100% free. Transform text into natural-sounding speech with multiple voices, languages, and adjustable speed. Works offline, completely private.
Free Online Audio Player - Play MP3, WAV, OGG & More
Free online audio player supporting MP3, WAV, OGG, FLAC, AAC formats. No signup required, 100% free. Play audio with speed adjustment and volume control. Works offline, completely private.
Free Online Video Player - Play MP4, WebM, AVI & More
Free online video player supporting MP4, WebM, AVI, MOV formats. No signup required, 100% free. Play videos with full controls and speed adjustment. Works offline, completely private.
Free Online Fraction Simplifier Calculator
Free online fraction simplifier to reduce fractions to lowest terms. No signup required - 100% free, private, and works offline. Get step-by-step explanation of the simplification process.
Free Online Geometric Series Calculator
Free online geometric series calculator to find the sum of geometric sequences. No signup required - 100% free, private, and works offline. Calculate finite or infinite series with step-by-step solutions.
Free Online GCD Calculator
Free online GCD calculator to find the greatest common divisor. No signup required - 100% free, private, and works offline. Calculate GCD using Euclidean algorithm with step-by-step explanation.
Free Online Arithmetic Series Calculator
Free online arithmetic series calculator to find the sum of arithmetic sequences. No signup required - 100% free, private, and works offline. Get step-by-step solutions for arithmetic progressions.
Free Online Arithmetic Sequence Generator
Free online arithmetic sequence generator with custom parameters. No signup required - 100% free, private, and works offline. Create any arithmetic progression by specifying first term, common difference, and number of terms.
Free Online LCM Calculator - Least Common Multiple
Free online LCM calculator to find the least common multiple of multiple numbers instantly. No signup required, 100% free. Uses prime factorization with step-by-step explanation. Works offline, completely private.
Free Online Permutation Generator - List All Arrangements
Free online permutation generator to create all possible arrangements of a list instantly. No signup required, 100% free. Shows detailed count and export options. Works offline, completely private.
Free Online Combination Generator - List All Selections
Free online combination generator to create all possible selections of items from a list instantly. No signup required, 100% free. Shows binomial coefficient and all subsets. Works offline, completely private.
Free Online TI-84 Calculator - Graphing Calculator Simulator
Free online TI-84 Plus CE graphing calculator simulator. No download, no signup required, 100% free. Plot graphs, solve equations, use statistical functions. Works offline, completely private.
Free Online Phone to VCF Converter - Batch Import Contacts
Free online phone to VCF converter for batch importing contacts. No signup required, 100% free. Convert phone numbers to vCard format with carrier detection. Works offline, completely private.