# Compress Audio

> Compress MP3, M4A, AAC, OGG, Opus and FLAC files online for free. Runs in your browser, so nothing is uploaded. Pick a level, a target size or a percentage. No sign-up, no watermark.

URL: https://www.converterrr.com/compress-audio

## 6 audio formats

- [Compress MP3](https://www.converterrr.com/compress-mp3): lossy, in the browser. Re-encodes at a lower bitrate (Light 192 kbps, Balanced 128 kbps, Strong 96 kbps).
- [Compress M4A](https://www.converterrr.com/compress-m4a): lossy, in the browser. Re-encodes AAC at a lower bitrate.
- [Compress AAC](https://www.converterrr.com/compress-aac): lossy, in the browser. Re-encodes AAC at a lower bitrate.
- [Compress OGG](https://www.converterrr.com/compress-ogg): lossy, in the browser. Re-encodes at a lower bitrate.
- [Compress Opus](https://www.converterrr.com/compress-opus): lossy, in the browser. Re-encodes Opus at a lower bitrate.
- [Compress FLAC](https://www.converterrr.com/compress-flac): lossless, in the browser. Re-compresses at FLAC's maximum compression level; the audio stays bit-identical.

## Need a specific size?

Set a target size or a percentage to reduce by, and each file is compressed to land at or just under it. FLAC is lossless, so it can't be aimed at a size.

## How to compress audio files

1. **Add your audio files.** Drop audio files onto the compressor. You can mix MP3, M4A or AAC in one batch.
2. **Choose a level or a target.** Balanced suits most files. Pick Light or Strong, or set a target size or a percentage to reduce by.
3. **Compress.** Click Compress. Each file stays in its own format and comes back smaller.
4. **Download.** Download files one by one, or everything at once as a ZIP.

## Good to know

- Lossy audio is compressed by lowering the bitrate; the file keeps its format, so it plays wherever it did before.
- FLAC stays lossless: it's re-compressed at maximum effort and comes back bit-identical. For big savings, convert it to MP3 or M4A.
- All audio files are compressed right in your browser with WebAssembly, so nothing is uploaded.

## Compress other files

[Compress images](https://www.converterrr.com/compress-images), [Compress videos](https://www.converterrr.com/compress-videos), [Compress documents](https://www.converterrr.com/compress-documents), [Compress archives](https://www.converterrr.com/compress-archives)

## Compressing audio files: frequently asked questions

### Which audio files can I compress?

MP3, M4A, AAC, OGG, Opus and FLAC. Each file comes back in its own format, just smaller.

### Does compressing audio files reduce quality?

Lossy formats trade a little quality for a much smaller file, and Balanced is tuned to look or sound the same for most uses. FLAC is compressed losslessly.

### Can I compress audio files to a specific size?

Yes, for MP3, M4A, AAC, OGG and Opus: set a target size or a percentage to reduce by; FLAC is lossless, so it can't be aimed at an exact size.

### Are my audio files uploaded?

All audio files are compressed right in your browser with WebAssembly, so nothing is uploaded.

### Can I compress several audio files at once?

Yes. Add up to 5 files at a time without an account, 10 with a free account and up to 500 on paid plans, mixing formats if you like, then download them individually or as one ZIP.