Tools Directory
Browse all free online tools by category
Media Tools
Image Compressor
Compress JPG/PNG/WebP images locally to protect your privacy.
Markdown to Image
Convert Markdown to high-quality images with code highlighting.
Image Cropper
Drag-and-drop crop area with multiple social media ratios, local processing for privacy.
WeChat 9-Grid
Split a long image into a 3x3 grid with custom borders and filters.
M3U8 Player
Play HLS / M3U8 streams in your browser with speed, volume, and fullscreen controls.
Blind Watermark
Hide a text or image watermark inside a photo. Extract later without the original. All processing happens in your browser.
Image Format Converter
Convert JPG/PNG/WebP/ICO locally with batch processing, ZIP download, and automatic EXIF stripping for privacy.
Batch Image to Text (OCR)
Local batch OCR via Tesseract.js: drop a .zip or many images, get a results pack with per-file .txt, merged text, and a CSV index. All in your browser.
Color Picker & Palette Extractor
Online color picker with HEX, RGB, and HSL conversion plus color harmonies. Extract a dominant-color palette from any image, all processed locally for privacy.
Background Remover
Remove a solid-color background from JPG, PNG, or WebP. Local processing for privacy; outputs transparent PNG or JPG on white.
SVG Optimizer
Local SVG compressor and cleaner. Removes XML metadata, comments, default attributes, and rounds path coordinates while preserving visual quality. Files never leave your device.
Document Tools
Text Diff
Compare two texts side by side with differences highlighted.
JSON Formatter
Format, validate, and beautify JSON online with syntax highlighting, key sorting, tolerant parsing, and local-only processing for privacy.
Word Counter
Count characters, words, sentences, paragraphs, bytes, and reading time online with locale-aware CJK and Latin handling, all locally for privacy.
Regex Tester
Test regular expressions online with live match highlighting, built-in pattern explanation, replace preview, and a common patterns library โ all local.
PDF Tools
Merge, split, and compress PDF files locally in your browser - files never leave your device.
Markdown Table โ CSV
Convert between Markdown tables and CSV both ways, entirely in your browser - your data is never uploaded.
Text Encoder / Decoder
Encode and decode Base64, URL-encoded strings, and HTML entities locally in your browser - your data is never uploaded.
Unix Timestamp Converter
Convert between UNIX timestamps (seconds, milliseconds, microseconds, nanoseconds) and human-readable dates, with auto-detected precision and support for local time and UTC.
JWT Decoder
Decode JWTs locally in your browser, inspect the header, payload, signature segment, expiration time, and common security warnings.
Time Zone Converter
IANA time zone converter. Pick a time + source zone, instantly see the same instant in any other zone, with accurate DST. All local, no upload.
URL Encoder / Decoder
Percent-encode and decode URL components, query strings, or full URLs. Auto-detects already-encoded input.
SQL Formatter
Format, minify, and beautify SQL online with 5 dialects (Standard / MySQL / PostgreSQL / SQLite / T-SQL), keyword case toggle, indent control, leading-comma style, and local-only processing for privacy.
Calculators
BMI Calculator
Calculate your Body Mass Index with metric and imperial units.
Currency Converter
Currency conversion using a built-in rate table (no network calls).
China Tax Calculator
Calculate Chinese salary, bonus, labor service, and VAT taxes โ all locally in your browser.
Unit Converter
Convert across 13 categories and 100 units including length, mass, temperature, area, volume, time, speed, data, energy, pressure, angle, and fuel economy โ all local for privacy.
Loan Calculator
Calculate commercial or mortgage loan monthly payments online โ equal monthly installment (EMI) or equal principal, with full amortization schedule and early-repayment savings, all processed locally for privacy.
Discount / Percentage Calculator
4-in-1 everyday percentage utility: discount, increase/decrease, share, and tax-included pricing, all processed locally for privacy.
Productivity Tools
Pomodoro Timer
25-minute focus sessions with 5-minute breaks to boost productivity.
Lottery Wheel
Enter names and randomly pick a winner.
QR Code Generator
Generate QR codes for text, URLs, emails, phones, SMS, WiFi, and vCards with optional logo overlay โ all locally in your browser.
QR Code Scanner
Scan QR codes via image upload or camera, decode and display structured results for URLs, WiFi, vCards, etc. โ all locally.
Cron Expression Generator
Build, paste, and explain cron expressions visually. See the next 5 run times locally without uploading anything.
Pomodoro Long Break
Pomodoro long break configurator with 4 presets (Classic / Long Focus / Ultradian / 52-17). Recommends config based on work intensity and time of day, all local.
Life Tools
Crypto Tools
Base64, MD5, SHA, AES, URL, HTML entities, hex, binary, CRC32, Caesar, Morse โ all done locally in your browser.
English Typing Test
Test your English typing speed and accuracy with timed or word-count modes and live performance rating.
US Address Generator
Generate realistic US addresses, names, phones, emails, and birthdays with one click โ all processing done locally.
Password Generator
Generate cryptographically secure passwords with a strength meter, configurable length and character classes, all locally in your browser.
Password Strength Checker
Check password strength locally in your browser using the zxcvbn algorithm, with entropy, crack time estimates, warnings and suggestions.
MBTI Personality Test
32-question MBTI personality test with 4-dimension radar chart and full type profile, all local and private.
Webhook Signature Validator
Local HMAC-SHA256/384/512 computation and signature verification for Stripe, GitHub, Shopify, and Slack webhooks. Data never leaves your browser.
Sleep Cycle Calculator
Calculate optimal bed and wake times based on 90-minute sleep cycles. All local, no upload.
Water Intake Calculator
Calculate your recommended daily water intake from weight, activity, and climate. 4 unit conversions + IoM cross-check + safety threshold, all local.
Caffeine Half-Life Calculator
Calculate residual caffeine at bedtime from your drinks and metabolism profile. Find your optimal cutoff time to avoid sleep disruption. 7 metabolism profiles + 11 common drinks, all local.
Step Converter
Convert steps to km / miles based on your height and stride length formula. 6 daily goal presets, calorie estimate, all local.