# Compress AAC

> Compress Advanced Audio Coding (AAC) 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-aac

- 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: [AAC converter](https://www.converterrr.com/aac-converter), [Compress audio files](https://www.converterrr.com/compress-audio).

## What compression does to AAC

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.

Need it much smaller? MP3 opens in every player. [Convert AAC to MP3](https://www.converterrr.com/aac-to-mp3).

## How to compress AAC

1. **Add your AAC files.** Drag and drop AAC 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 AAC files are processed right in your browser, usually in seconds.
4. **Download.** Download each smaller AAC, or everything at once as a ZIP.

## Good to know

- A .aac file is a bare AAC audio stream without an MP4 container. Compressing lowers the bitrate and keeps it as .aac.
- Some players won't open bare .aac files. If that's a problem, convert AAC to MP3 or M4A instead.
- 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.
- AAC compression runs entirely in your browser with WebAssembly, so nothing is uploaded and your files never leave your device.

## About the AAC format

AAC is the successor to MP3, delivering better quality at the same bitrate. It's the default audio codec on Apple devices and YouTube.

|  | AAC |
| --- | --- |
| Full name | Advanced Audio Coding |
| Type | Audio |
| Extensions | .aac |
| MIME type | audio/aac |
| Best for | streaming, mobile audio and video soundtracks |
| Properties | lossy compression |

## Compress other audio files

[Compress MP3](https://www.converterrr.com/compress-mp3), [Compress M4A](https://www.converterrr.com/compress-m4a), [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 AAC: frequently asked questions

### How do I compress an AAC file?

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

### Does compressing AAC reduce quality?

A little, by design: AAC 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 AAC get?

A 256 kbps AAC re-encoded at 128 kbps is half the size; files that are already low-bitrate have less to give.

### Can I compress AAC 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 AAC files here?

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

### Is the AAC compressor free?

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

### Should I convert my AAC instead?

Sometimes. MP3 opens in every player. The AAC to MP3 converter does that in one step.