All local tools
A private toolkit that stays on your device. Nothing here is uploaded for processing.
JSON Formatter
Pretty-print or minify JSON in your browser.
JSON Validator
Check whether JSON is valid without sending it anywhere.
JSON Minifier
Remove whitespace from JSON in your browser.
Base64 Encoder / Decoder
Encode or decode Base64 text with UTF-8 support.
URL Encoder / Decoder
Percent-encode or decode URL components in your browser.
UUID Generator
Generate RFC 4122 version 4 UUIDs in your browser.
JWT Decoder
Decode a JWT header and payload locally. Signature is not verified.
Hash Generator
Create SHA hashes locally with the Web Crypto API.
Timestamp Converter
Convert Unix time and ISO dates locally.
Regex Tester
Test a regular expression against text in your browser.
Word Counter
Count words, characters, lines, and sentences locally.
Case Converter
Convert text between upper, lower, title, camel, snake, and kebab case.
Duplicate Line Remover
Remove duplicate lines while keeping the first occurrence.
Text Sorter
Sort lines alphabetically in your browser.
Text Diff
Compare two texts line by line.
Color Picker
Pick a color and copy HEX, RGB, and HSL.
HEX ↔ RGB Converter
Convert colors between HEX and RGB in your browser.
RGB ↔ HSL Converter
Convert colors between RGB and HSL.
Gradient Generator
Build a CSS linear gradient and copy the code.
Contrast Checker
Check WCAG contrast between two colors.
Image Compressor
Compress an image locally with a quality slider.
Image Resizer
Resize an image locally and download a PNG.
PNG → JPG
Convert a PNG to JPEG in your browser.
JPG → WebP
Convert a JPEG to WebP in your browser.
Image → Base64
Turn an image file into a data URL.
QR Code Generator
Create a QR code from text or a URL, then download a PNG.
Password Generator
Generate strong passwords with cryptographically secure randomness.
Random String Generator
Generate a random string from a custom character set.
Percentage Calculator
Calculate percents, reverse percents, and percent change.
Aspect Ratio Calculator
Simplify ratios and compute matching width or height.
Timezone Converter
Convert your current local time into another time zone.