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Tools that never leave your browser
Fast, free utilities for developers and everyday work — processed 100% locally on your device. Pull the plug and they still work.
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Developer Tools10
JSON Formatter & Validator
Format, validate, beautify or minify JSON instantly — right in your browser.
Base64 Encoder / Decoder
Convert text to Base64 and back, with full Unicode support — all in your browser.
URL Encoder / Decoder
Encode and decode URLs and URI components safely — instantly, in your browser.
UUID Generator
Generate random v4 UUIDs in bulk — cryptographically random, right in your browser.
Unix Timestamp Converter
Convert Unix epoch timestamps to human-readable dates and back — with live current time.
HTML Entity Encoder / Decoder
Encode special characters to HTML entities and decode them back — safe for pasting code into pages.
Color Converter
Convert colors between HEX, RGB and HSL — with a visual picker and one-click copy.
Number Base Converter
Convert numbers between binary, octal, decimal, hexadecimal and any base from 2 to 36.
Regex Tester
Test regular expressions with live highlighting, match groups, replacement and a pattern cheat sheet.
JWT Decoder
Decode JSON Web Tokens locally: inspect the header, payload claims and expiry — the token never leaves your browser.
Image Tools16
QR Code Generator
Create QR codes for URLs, text, Wi-Fi and more — customizable size and error correction.
QR Code Scanner
Decode QR codes from images right in your browser — upload, paste or drop a picture.
Image Compressor
Compress JPEG, PNG and WebP images with an adjustable quality slider — instant size savings preview.
Image Format Converter
Convert images between PNG, JPEG and WebP formats — instant, private, in your browser.
Image ⇄ Base64 Converter
Encode images as Base64 data URIs or decode a Base64 string back into an image — locally.
Image Resizer
Resize images to exact pixel dimensions with aspect-ratio lock — JPEG, PNG and WebP output.
EXIF Metadata Viewer
Inspect camera, lens, exposure and GPS metadata hidden inside JPEG photos — fully local.
Image Watermark Tool
Add custom text watermarks to photos — position, size, opacity and tiling — all in your browser.
Image Color Picker
Pick exact colors from any image — click to grab HEX, RGB and HSL values with a zoom loupe.
Favicon Generator
Turn any image into a complete favicon set — ICO with 16/32/48px plus PNG and Apple touch icons.
Image Cropper
Crop images with a draggable selection and aspect-ratio presets — free, private, in-browser.
Image Filters & Photo Editor
Adjust brightness, contrast, saturation and more with live preview — plus one-click presets.
Image to ASCII Art
Turn images into ASCII art with adjustable width and character sets — copy or download as image.
Image Rotator
Rotate images by 90° steps or any custom angle, and flip horizontally or vertically — locally.
EXIF & Metadata Remover
Strip location, camera and timestamp metadata from photos before sharing them — fully local.
Color Palette Extractor
Extract dominant colors from any image and get a ready-to-use palette with HEX and RGB codes.
Calculators10
Percentage Calculator
Three everyday percentage questions, answered instantly: X% of Y, X is what % of Y, and % change.
BMI Calculator
Calculate your Body Mass Index in metric or imperial units, with WHO category feedback.
Date Difference Calculator
Calculate the exact difference between two dates in days, weeks, months and years — plus business days.
Random Number Generator
Generate random numbers in any range — unique or repeatable, one or in bulk.
Unit Converter
Convert length, weight, temperature, area, volume, speed and data-storage units instantly — all locally.
Scientific Calculator
Free online scientific calculator with trigonometry, logarithms, powers, factorials, memory keys and history.
Mortgage Calculator
Calculate monthly mortgage payments, total interest and a full amortization schedule — free, private, in-browser.
Age Calculator
Calculate exact age in years, months and days, plus totals, next birthday countdown and zodiac signs — free and private.
Tip Calculator
Split the bill and calculate tips in seconds — tip amount, total and per-person share. Free and private.
Compound Interest Calculator
See how your money grows with compound interest — contributions, compounding frequency and a yearly chart. Free and private.
Security Tools2
Text Tools6
Word & Character Counter
Count characters, words, sentences and paragraphs in real time — with reading time estimate.
Case Converter
Convert text between lowercase, UPPERCASE, Title Case, camelCase, snake_case and more.
Text Reverser
Reverse text character by character, word by word, or line by line — instantly.
Remove Duplicate Lines
Deduplicate lines, strip blank lines and sort — with a live count of what was removed.
Text Diff — Compare Texts
Compare two texts line by line with additions and deletions highlighted — a free, private, in-browser diff checker.
Markdown Editor
Write Markdown with a live preview, toolbar, word count and HTML export — free, private, auto-saved locally.