# Compress Audio

Compress audio to a smaller file by choosing a quality, with the finished size shown before you start. Free, no signup, and nothing is uploaded.

Canonical page: https://filetity.com/compress-audio

## Capabilities

- Free: Yes, with no watermark and no page limit.
- Account required: No. There is no account system.
- Processed on device: Yes. The file is read by your browser and never uploaded. There is no server to send it to.
- Formats: MP3, M4A, WAV, OGG, FLAC and AAC in. MP3, M4A, OGG or WAV out.
- Limits: A file already at or below the target bitrate cannot get smaller without sounding worse, and the page says so rather than re-encoding it for nothing.
- Mobile: Yes, on any modern mobile browser. Large files are limited by the memory the phone gives the browser.
- Offline: Yes, once the page has loaded. The tool keeps working with no network connection.

## Questions

### How much smaller can it get?

It depends entirely on what you start with. A WAV drops by around ten times because it was never compressed. A 320 kbps MP3 at the voice setting drops by about eight times. A file that is already 64 kbps has almost nothing left to give, and the page tells you that instead of pretending.

### Which quality should I pick for speech?

The smallest one. Speech carries far less information than music, and the voice setting is usually indistinguishable on a podcast, a lecture or a voice note while producing a file a fraction of the size. Save the higher settings for music, where the difference is audible.

### Can compressing make the file larger?

Not here. The target is capped by what the source actually spends, so asking for high quality on a low bitrate recording gives you the low bitrate rather than an inflated file with no extra detail in it. That inflation is exactly what a compressor that only reads its own preset does.

### Is the loss permanent?

Yes. Every lossy compression throws information away for good, and compressing an already compressed file does it a second time. Keep the original if it is the only copy, and treat the compressed one as the version you send rather than the version you archive.

### Should I change the format as well as the size?

Only if the destination requires it. M4A and OGG are more efficient than MP3 and sound better at the same size, so if whatever you are sending to accepts them, they are the better choice. If it has to play anywhere at all, MP3 remains the safe answer.

## Related tools

- [WAV to MP3](https://filetity.com/wav-to-mp3): Convert a WAV recording to MP3, around a tenth of the size.
- [MP3 Cutter](https://filetity.com/mp3-cutter): Cut an MP3 or any audio file down to the part you want.