Convert an uncompressed WAV file to space-saving MP3 locally in your browser - with a selectable bitrate. No upload.
Running locally on your device ...
Running locally on your device ...
0%
Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
WAV stores audio uncompressed - one minute of stereo CD quality weighs around 10 MB. For a recording you want to share, email or load onto a phone, that is impractically large. This tool converts your WAV file to MP3 locally, shrinking it to a fraction of the size.
MP3 uses a psychoacoustic model: it selectively removes portions the human ear barely perceives and compresses the rest. The higher the chosen bitrate, the less is lost - 320 kbps is, for most ears, practically indistinguishable from the source.
For spoken recordings such as dictations or interviews, a low bitrate in mono is usually entirely sufficient and saves extra space; for music, stereo with ample headroom pays off. The conversion runs entirely locally with ffmpeg.wasm - your recording never leaves your device.
| Input formats | WAV |
|---|---|
| Auto-conversion | MP3, MP4 |
| Output format | MP3 |
| Batch processing | No |
| Processing | Locally in your browser (WebAssembly) |
| File upload | None |
Limitations: MP3 is lossy - the lower the bitrate, the more audible the difference on complex music. For archiving or further editing, WAV or a lossless format like FLAC remains the better choice. One file per run.
No, the conversion runs entirely locally in the browser.
192 kbps is a good everyday default, 320 kbps for music with maximum headroom, 128 kbps is enough for speech.
Usually to a tenth or a fifth of the WAV size, depending on the chosen bitrate.
Yes, there is the sibling tool "Convert MP3 to WAV" for that.
AVI to MP3 · M4A to MP3 · WebM to MP3 · FLAC to MP3 · MP3 to WAV