Convert audio files
Recordings of meetings, interviews and voice notes are among the most sensitive files people own. This converter never sends them anywhere.
- Runs entirely in your browser
- Works offline
- No upload
- No sign-up
- No watermark
Loading the tool…
How it works
- Drop an audio file.
- Choose the target format and bitrate.
- Start, then download the result.
Why nothing is uploaded
Every operation on this page is done by code running inside your browser tab, using the same engine that renders web pages. The file is read from disk into your tab’s memory, transformed there, and written back out as a download. It is never sent anywhere — not to us, not to a third party.
Verify it yourself
- Open your browser’s developer tools (F12) and select the Network tab.
- Load your file and run the tool.
- The only requests you will see are the tool’s own code and, once cached, none at all.
Frequently asked questions
Does converting MP3 to MP3 improve anything?
No — it can only lose more. Every lossy re-encode discards a little more detail. Convert from the highest-quality source you have, and only once.
Which format for archiving?
FLAC. It is lossless, so it is bit-exact with the original WAV, at roughly half the size, and every serious audio program reads it.
Is my video uploaded?
No. FFmpeg itself is compiled to WebAssembly and runs inside this tab; the file is read from disk into memory and the result is written back out. Nothing is transmitted, which is why a two-hour film will not work here — your device is doing all of it.