Tools
Everything runs locally. Your data never leaves the browser.
JSON Studio
Format, minify, sort, validate with exact error positions, and diff two JSON documents. Runs entirely in your browser.
Timestamp
Convert Unix timestamps and dates both ways, auto-detecting seconds vs milliseconds. Also shows ISO 8601, RFC 2822, relative time, day-of-year, ISO week, and a multi-timezone table.
Regex Lab
Test regular expressions live: highlight hits, list every match with positions and groups, preview replacements, and start from built-in templates for email, URL, IPv4, dates and more.
Encode / Decode
Base64, Base64URL, URL, HTML entities, Unicode escapes and hex — plus JWT decoding with exp / nbf checks. Everything runs locally; tokens never leave the browser.
Text Diff
Line-by-line diff with added and removed rows, plus word-level highlighting. Ignore case or whitespace, and export a standard unified diff in one click.
Hash & Checksum
Compute CRC32, MD5 and SHA-1/256/384/512 at once — for text or a file. Paste an expected checksum and it tells you which one matches.
Generator
Generate UUID v4 / v7, ULID, passwords, random strings and slugs. Passwords show live entropy and strength, with an option to exclude lookalike characters such as O0Il1.
Color & Contrast
Parse hex / rgb / hsl, convert between notations, and compute WCAG contrast with AA / AAA levels. Includes a full 50–900 tint ramp and tells you whether text on a colour should be black or white.
Base & Units
Convert between any bases from 2 to 36 with grouped binary and byte views, plus ten unit categories — length, mass, area, volume, data, time, speed, pressure, energy and temperature — each listing every equivalent at once.
Image Compress
Resize, rotate, flip and convert images (WebP / JPEG / PNG) right in the browser, with an automatic quality search to hit a target file size. Nothing is uploaded — it all runs on a local canvas.