About MP3 to WAV
A small, focused tool that does one thing: turn an MP3 into a real WAV file, entirely in your browser.
Why we built this
Most "free" online converters ask you to upload your file to a server, wait in a queue, and hope it gets deleted afterward. We wanted something different: a converter that runs entirely on your own device, using the audio decoding and encoding capabilities already built into modern browsers. No upload, no waiting on a server, no account required.
The result is a tool that's just as fast on a slow connection as a fast one, because your file never leaves your machine — and there's nothing to store, lose, or leak on our end, because we never see it.
What we care about
Privacy by default
Your audio is decoded and re-encoded on your own device. We built it this way from the start, not bolted on as an afterthought.
One job, done well
MP3 to WAV, and nothing else. No account walls, no upsells, no feature creep — just a fast, focused tool.
No dark patterns
No fake progress bars, no forced sign-ups, no surprise limits. What you see is what the tool actually does.
How it's built
The site itself is a static, server-rendered shell built with Astro and TypeScript. The actual conversion logic runs entirely client-side using native Web Audio APIs — AudioContext.decodeAudioData to decode your MP3, and a small hand-written encoder to write a standard PCM WAV file. There's no backend service involved in the conversion step, which is exactly why it can work without ever touching your file.
Ready to convert a file?
It only takes a few seconds, and nothing leaves your device.
Open the converter