A file tool that keeps to itself.

a → b started from a small frustration: every “free online converter” wants to upload your file to a server you’ve never heard of, wrapped in ads and trackers, to do something your own computer could do in a second.

So this one doesn’t. Every conversion runs inside your browser using WebAssembly. Your files are read into memory, transformed on your own CPU, and handed back — they never touch a network. You don’t have to take our word for it: open your browser’s Network tab and watch it stay empty while you work.

No accounts. No tracking. No file-size games designed to sell you a subscription. Just a small, sharp set of tools that respect your privacy by construction.