Free Online
Developer Toolbox
Format JSON, encode Base64, generate UUIDs, convert timestamps — instant results, zero server, complete privacy.
All Tools
JSON Formatter
Format, validate and beautify JSON data instantly.
JSON to TypeScript
Convert JSON objects into TypeScript interfaces automatically.
Base64 Encode
Encode text or data to Base64 format online.
Base64 Decode
Decode Base64 encoded strings back to plain text.
URL Encoder / Decoder
Encode and decode URLs and query string parameters.
JWT Decoder
Decode and inspect JWT token headers and payloads client-side.
UUID Generator
Generate cryptographically secure UUID v4 values.
Slug Generator
Convert any text into a clean, URL-friendly slug.
Color Picker
Pick colors and convert between HEX, RGB, and HSL formats.
Timestamp Converter
Convert Unix timestamps to human-readable dates and back.
Text Diff Checker
Compare two texts and highlight differences line by line.
HTML Previewer
Write and preview HTML code live in a sandboxed browser frame.
Markdown Previewer
Write Markdown and see the rendered output in real time.
Tools Built for Developers
Every tool runs entirely in your browser using native JavaScript APIs. No server, no logs, no tracking — just instant results.
Lightning Fast
Zero server round-trips. Process any size data instantly using browser-native APIs.
Privacy First
Your data never leaves your device. No cookies, no analytics, no data collection.
Always Free
No subscriptions, no limits, no hidden fees. Free for every developer worldwide.
Works Everywhere
Mobile-first, fully responsive design. Any tool, any device, any screen size.