Simple Dev Tools

Privacy-first dev tools that run in your browser

What is Simple Dev Tools?

Simple Dev Tools is a free collection of everyday developer utilities that work right in your browser. It includes things like JSON formatting, JWT decoding, Base64 encoding and decoding, UUID generation, URL encoding, regex testing, and more. The site is built for speed and privacy, so your data stays on your device and never leaves your browser. No account is needed, there are no limits, and many tools keep working offline. It is made to help developers save time with quick, simple tools that are easy to access and use.

Key features

Runs entirely inside your browser for instant use.
Formats JSON and validates syntax with one click.
Decodes JWTs and inspects token contents quickly.
Encodes and decodes Base64 and URL strings.
Generates UUIDs and strong random passwords.
Works offline for many tools without internet.