# Compress M4A

> Compress MPEG-4 Audio (M4A) files online for free. The compressor re-encodes AAC at a lower bitrate. Runs in your browser, so your files never leave your device. Or set an exact target size.

URL: https://www.converterrr.com/compress-m4a

- Compression: lossy, runs in the browser (nothing is uploaded).
- API: `POST /api/v1/jobs` with `"operation": "compress"` and an optional `compression_level` or `target_size` (paid plans).
- Format: [M4A converter](https://www.converterrr.com/m4a-converter), [Compress audio files](https://www.converterrr.com/compress-audio).

## What compression does to M4A

Re-encodes AAC at a lower bitrate.

- **Light:** A high bitrate: indistinguishable from the original for most listeners.
- **Balanced (default):** The default: a moderate bitrate that's fine for everyday listening.
- **Strong:** Lowest bitrate: smallest file, best kept for speech and podcasts.

## How to compress M4A

1. **Add your M4A files.** Drag and drop M4A files onto the compressor, paste them, or click to browse. You can add several at once.
2. **Pick a level or a target.** Balanced is selected and suits most files. Choose Light to stay closer to the original or Strong for the smallest file, or set a target size or a percentage to reduce by.
3. **Compress.** Click Compress. Your M4A files are processed right in your browser, usually in seconds.
4. **Download.** Download each smaller M4A, or everything at once as a ZIP.

## Good to know

- M4A is AAC audio in an MPEG-4 container, the format of iPhone Voice Memos and many music and podcast apps. Compressing re-encodes the AAC at a lower bitrate.
- AAC sounds better than MP3 at the same bitrate, so an M4A can go lower before you notice.
- Need to meet an upload limit? Set a target size (or a percentage to reduce by) in the compressor and the recording is compressed to fit.
- M4A compression runs entirely in your browser with WebAssembly, so nothing is uploaded and your files never leave your device.

## About the M4A format

M4A is an audio-only MP4 file, usually containing AAC (or lossless ALAC). It's Apple Music's and Voice Memos' default format.

|  | M4A |
| --- | --- |
| Full name | MPEG-4 Audio |
| Type | Audio |
| Extensions | .m4a |
| MIME type | audio/mp4 |
| Best for | iTunes/Apple Music libraries and voice memos |
| Properties | lossy compression |

## Compress other audio files

[Compress MP3](https://www.converterrr.com/compress-mp3), [Compress AAC](https://www.converterrr.com/compress-aac), [Compress OGG](https://www.converterrr.com/compress-ogg), [Compress Opus](https://www.converterrr.com/compress-opus), [Compress FLAC](https://www.converterrr.com/compress-flac)

## Compressing M4A: frequently asked questions

### How do I compress an M4A file?

Drop the M4A onto the compressor above, keep Balanced or pick another level, and click Compress. Download the smaller M4A when it's done; it usually takes a few seconds.

### Does compressing M4A reduce quality?

A little, by design: M4A is a lossy format. Balanced is tuned to look the same for most uses; choose Light if you want to stay closer to the original.

### How much smaller will my M4A get?

It depends on the original bitrate: 256 kbps music and high-quality voice memos shrink substantially, low-bitrate files much less.

### Can I compress M4A to a specific size?

Yes. Set a target size in the compressor, or a percentage to reduce by, and the file is compressed to land at or just under it.

### Is it safe to compress M4A files here?

Yes. M4A files are compressed inside your browser with WebAssembly and never uploaded to a server.

### Is the M4A compressor free?

Yes. Compression is free with no watermark and no sign-up, within the same daily allowance as conversions.