onlinedev.tools is a privacy‑first collection of developer utilities that run entirely in your browser. Format JSON, decode JWTs, generate UUIDs, test regex, convert colors, and more — all without sending data to a server.
We built it to be fast, simple, and safe, so you can use it for quick tasks without worrying about privacy or setup. It’s free, no sign‑ups, and optimized for developers who just want tools that work.
