This started out of a simple frustration — there was no single place to do all the small things developers need day-to-day. JSON diffing here, Base64 decoding there, a cron builder somewhere else. Tabs everywhere. So we built our own toolkit, quietly, for personal use. When friends and colleagues got a look at it, they wanted in too. The feedback was warm and honest, and what started as a handful of tools grew steadily into what you see here.
Well-wishers kept nudging us to open it up — so we did. Dev Tools is free, carries no ads, and we never store or inspect your data — with one exception: when you use the share feature, a snapshot is saved server-side to generate a link, and anyone with that link can view it. It exists because developers deserve a calm, reliable place to get things done without distractions or paywalls. We hope it earns a permanent tab in your browser. See Privacy →
Your data is never stored or seen by us. Everything you paste, upload, or test in these tools runs in your browser or is processed in-flight on the server — nothing is saved to a database, logged, or inspected. Close the tab and it's gone.
Share links are intentionally public. When you use the share feature, a snapshot of your data is saved server-side to generate a link. Anyone who receives that link can view the full content and share it further. Only share data you are comfortable making accessible to others. Shared links are automatically removed after 365 days of inactivity.
These tools are built for developer convenience. We want you to work fast and safely — that means your data belongs to you, not us.
A free, ad-free collection of browser-based utilities for developers. Validate JSON, compare diffs, encode Base64, generate UUIDs, test regex, decode JWTs, and more — all in your browser, nothing stored.