A free, fast, privacy-first collection of browser-based utilities for developers — no account required, no data ever leaves your browser.
Dev Toolbox (devkitbox.xyz) is an open collection of everyday developer utilities designed to be fast, distraction-free, and completely private. Every tool runs entirely in your browser using client-side JavaScript. When you paste JSON, a JWT token, or a password into any tool on this site, that data is processed locally on your machine and never transmitted to any server.
We built Dev Toolbox because developer tools should not require sign-ups, subscriptions, or cloud accounts. The best tool is the one that is instantly available, works offline, and does not ask for anything in return.
Beyond interactive tools, Dev Toolbox offers a growing library of copy-ready code snippets for common developer tasks. Each snippet page includes multiple examples with explanations, a How-to-Use guide, and an FAQ section.
Current snippet categories include Linux commands (grep, sed, awk, find, curl, ssh, tar, chmod, ps), Docker (compose, build, run), Git (rebase, stash, cherry-pick, reflog), SQL (joins, window functions), and Shell scripting (loops, functions).
The Dev Toolbox blog covers practical topics that come up in everyday development work — not tutorials from scratch, but focused guides that assume you can already code and want to go deeper. Topics include API debugging, Git workflows, Docker orchestration, SQL optimization, and security concepts like JWT tokens.
Yes, completely free. There are no paid tiers, no premium features, and no sign-up wall. All tools on the site are available to everyone without restriction.
Yes. Every tool on Dev Toolbox runs entirely in your browser using client-side JavaScript. Data you enter — including passwords, JWT tokens, JSON payloads, and source code — is never transmitted to any server. It stays on your machine.
Once the page has loaded, most tools work offline since there are no server calls. For best results, load the page while online and then you can continue using it without a connection.
Open an issue on our GitHub repository with your suggestion. We regularly add new tools based on community requests.
We do not use tracking cookies or analytics that identify individual users. Please see our Privacy Policy for full details.