// 10 tools · client-side · zero tracking

Dev tools that
just work.

Fast, private, browser-based utilities for developers and designers. No login. No upload. No nonsense.

Browse Tools → GitHub
10
Tools
0ms
Server calls
100%
Client-side
// tools

Everything you need

{ }
JSON Formatter & Validator
Beautify, minify, and validate JSON instantly. Highlights errors with line numbers.
formatter
🔑
JWT Decoder
Decode and inspect JWT tokens. View header, payload, and expiry — all client-side.
auth
.*
Regex Tester
Test and debug regular expressions with real-time match highlighting and group output.
testing
⏱
Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates instantly.
datetime
64
Base64 Encoder / Decoder
Encode or decode Base64 strings and files right in your browser.
encoding
#
UUID Generator
Generate v4 UUIDs in bulk. Copy single or multiple with one click.
generator
⚙︎
SQL Formatter
Beautify raw SQL queries. Supports MySQL, PostgreSQL, and more.
database
🖼
Image Compressor
Compress JPEG/PNG images in-browser. No uploads to any server — ever.
images
◑
Color Contrast Checker
Check WCAG AA/AAA contrast ratios. Essential for accessible UI design.
accessibility
✦
CSS Beautifier & Minifier
Format messy CSS or minify it for production in one click.
css
⚡
Instant
Everything runs in your browser. No waiting for servers. No round trips.
🔒
Private
Your data never leaves your machine. No accounts, no logging, no tracking.
🛠
Built for Devs
Clean interface, keyboard-friendly, dark mode. Tools made by devs, for devs.
// blog

Developer guides

JSON
How to Format JSON Online
Beautify, validate and minify JSON instantly in your browser.
 JSON · Debug
How to Fix Invalid JSON
Every common JSON error and exactly how to fix it.
 JWT
What is a JWT Token?
Header, payload, signature, and how JWT auth works.
 JWT · Python
Decode a JWT in Python
PyJWT, python-jose, and manual base64 decode with examples.
 Images
Compress PNG Without Losing Quality
5 methods to reduce PNG size with no visible difference.
 Images
JPEG vs PNG vs WebP
Which format to use — with real file size comparisons.
 Regex
Regex Cheat Sheet
Complete reference — anchors, quantifiers, groups, lookaheads.
 JSON · JS
Validate JSON in JavaScript
try/catch, type check, and JSON Schema with ajv.
 DateTime · JS
Timestamp to Date in JavaScript
new Date(), Intl.DateTimeFormat, timezones explained.
 CSS
CSS Minification Guide
How it works, how much it saves, and build tool setup.
 Accessibility
WCAG Color Contrast Guide
AA and AAA requirements, common failures, and fixes.
 IDs
UUID vs ULID
Sortability, DB performance, and when to use each.
View all 28 guides →

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