Twenty tools, one job: not getting in your way.

What this is

anan.zh.kg is a small, fast, free toolbox for developers. Twenty utilities for the things you actually do every day — generate a UUID, encode some Base64, decode a JWT, format a JSON, parse a cron expression, test a regex.

No login. No tracking. No upsell. No "subscribe to continue".

Why I built it

I was tired of opening ten different websites to do ten tiny things. Most of them were slow, full of ads, and asked for my email. So I built one site that does all of them, fast.

How it works

Every tool runs entirely in your browser. There is no backend, no database, no analytics script that touches your input. When you paste a JWT, decode a Base64 string, or hash some text, the operation happens locally on your machine. We never see it.

This also means the site is fully static and served from GitHub Pages. The total cost of running it is zero.

The design

The design is deliberately tool-like, not blog-like. Monospace for data, terminal-style prompts in the navigation, sharp 4px corners, high-density layouts, no shadows or rounded blobs. Every page is built to load in under 200ms and to be readable on a phone in a meeting room.

Source code

Everything is open source. github.com/qq136692547-cmyk/anan-devtools. Issues and pull requests welcome.

Get in touch

Found a bug? Want a tool that is missing? Open an issue on GitHub.