About DevToolBox
11 free, fast, private tools for developers and creators. Built because the alternatives are slow, ad-cluttered, and upload your data to their servers.
Why We Built This
Every developer uses online tools daily — formatting JSON, testing regex, comparing diffs, converting timestamps. But most tool sites are painful: they're slow, covered in pop-ups, and quietly upload your data to their servers.
We thought: what if there was a tool site that respected developers? One that's fast because everything runs in your browser. Private because nothing ever leaves your machine. And free because you shouldn't need a subscription to format JSON.
So we built DevToolBox. 11 tools, zero servers, zero tracking. Just open a tool and use it. Works offline. Works on any device. No account needed, ever.
Our Principles
Privacy First
Every tool runs 100% in your browser. Your files, your JSON, your regex patterns — none of it ever touches a server. We literally cannot see your data.
Speed Over Everything
No network round-trips, no cold starts, no loading spinners. Client-side processing means instant results, even on slow connections. Works offline too.
Free Forever
No premium tiers, no feature gates, no sign-up walls. Every tool is fully unlocked. We keep the lights on through ads, not subscriptions.
Open Source
The entire codebase is public on GitHub. You can audit the code, suggest features, fix bugs, or fork it and build your own. Transparency is non-negotiable.
How It's Built
Want to Contribute?
DevToolBox is open source. Found a bug? Want a new tool? PRs and issues are welcome.