Why I Built Simple Dev Tools

A free collection of privacy-first developer utilities that run entirely in your browser.

I was tired of opening a new tab every time I needed to format JSON, decode a JWT, or generate a UUID.

Most online tools felt the same.
Slow.
Cluttered.
And worse — they sent your data somewhere.

I didn’t want another tool that required an account or uploaded my tokens to some random server.

I just wanted something fast, clean, and private.

So I built Simple Dev Tools.

It’s a free collection of everyday developer utilities that run completely inside your browser.

Format JSON.
Decode JWTs.
Generate UUIDs.
Test regex.
Encode Base64.
Count LLM tokens.

And more — currently 45 tools, with new ones being added.

No sign-up.
No limits.
No data leaving your device.

The idea was simple.

If a tool needs to process sensitive data, it should stay on your machine.

Everything here is designed to feel instant and stay private by default.

I use it almost every day myself. That’s the best test.

If you want a clean set of developer tools that respect your privacy, you can try them here:

https://simpledevtools.org

Bookmark it.
Use it whenever you need.
And if you find it useful, feel free to share it with other developers.