Your offline developer Swiss Army knife — Base64, JWT decoder, URL encoder, JSON formatter, UUID generator, regex tester, hash calculator, and more. 100% private.
🔗 Try it free: https://microsaas-lab.vercel.app/devUtils
The Problem
Every developer has a browser bookmark folder of single-purpose tools: one site to decode JWTs, another to format JSON, another for Base64, another for UUID generation. Every time you use them, you're pasting potentially sensitive data — tokens, credentials, API responses — into third-party servers. And every one of those sites has ads, paywalls, or tracking.
There's no reason any of these operations need to touch a server.
Introducing DevUtils
DevUtils bundles all the tools you reach for ten times a day into a single offline-first page. Every operation runs locally in your browser — Base64 encode/decode, JWT decode, URL encode/decode, JSON format/minify, UUID generation, regex testing, hash calculation, and more. No servers, no ads, no tracking.
DevUtils is completely free, requires no account or installation, and runs entirely in your browser. Your data never leaves your machine.
Key Features
- Base64 encode/decode
- JWT decoder — parse header, payload, and verify structure
- URL encode/decode
- JSON format, minify, and validate
- UUID v4 generator (bulk generation supported)
- Regex tester with live match highlighting
- Hash calculator (MD5, SHA-1, SHA-256, SHA-512)
- 100% offline — works without internet connection
Who Is It For?
Frontend and backend developers, API integrators, security engineers, and any developer who keeps 10 different tool tabs open.
Try It Free
👉 https://microsaas-lab.vercel.app/devUtils
No sign-up. No install. Open it and start immediately.
If you find it useful, I'd love it if you shared it with someone who could benefit. I'm also building more free tools at https://microsaas-lab.vercel.app feel free to explore the whole collection.
Have feedback or a feature request? Drop a comment below I read everything.
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