dev@krumb.dev:~$
krumb.dev:~$
A privacy-first toolkit for developers. 47 tools. Zero servers. Zero signup.
KRUMB.DEV is a collection of developer utilities — JSON formatters, JWT decoders, regex testers, code beautifiers, generators, converters, and more — packaged into a single, keyboard-friendly interface. Every tool runs in your browser. Nothing is uploaded.
It was built because the existing options are fragmented (one bookmark per tool), invasive (signup walls, tracking scripts, data leakage), or cluttered with ads and upgrade prompts. KRUMB.DEV is none of those things.
Every developer has had this moment: you need to quickly format some JSON, decode a JWT, or test a regex. You search, find a tool, paste your data — and hesitate. Is this site logging my token? Do I need another account? Will my data end up in someone else's training set?
KRUMB.DEV removes that hesitation entirely. Your data never leaves your device because the tools don't need a server. For the few operations that genuinely need one (DNS lookups, SSL checks), the server functions are minimal, stateless, and log nothing.
No account, no installation. Every tool is one click away from the homepage or ⌘K command palette.
Paste, type, or generate. The tool processes everything locally using your browser's native APIs.
One-click copy. No data stored, no history saved on a server. Close the tab when you're done.
All core tools — formatting, encoding, decoding, generating, validating — execute in your browser using Web APIs. No data is transmitted to any server.
No analytics scripts, no cookies, no fingerprinting, no session recording. What you do on KRUMB.DEV stays on your machine.
There is no signup flow, no user database, no "forgot password" email. Every visitor gets the full experience immediately.
The entire codebase is MIT-licensed on GitHub. You can audit it, fork it, deploy your own instance, or contribute improvements.
Built with Next.js, TypeScript, and Tailwind CSS. Deployed as a static site with serverless edge functions for the few operations that require server interaction. No database. No background workers. No external services. This makes it fast, cheap to run, and trivially deployable anywhere that supports Node.js.