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.

AAC→smaller AAC→MP3 JPG→smaller AAC→WAV PNG→smaller AAC→M4A MP4→smaller AAC→FLAC MP3→smaller AAC→OGG PDF→smaller AAC→Opus WebP→smaller AAC→WMA HEIC→smaller AAC→AIFF DOCX→smaller AAC→AMR GIF→smaller AAC→M4B SVG→smaller AAC→AC3 MOV→smaller AAC→MP2 AVIF→smaller AAC→WEBA AAC→OGA M4A→smaller AAC→MKA AAC→WV WebM→smaller AAC→AU AAC→TTA MKV→smaller PNG→JPG JPG→PNG XLSX→smaller PNG→WebP JPG→WebP EPUB→smaller WebP→PNG WebP→JPG AVI→smaller HEIC→PNG HEIC→JPG FLAC→smaller MP4→MP3 PNG→JPEG PPTX→smaller JPG→JPEG JPEG→PNG ZIP→smaller JPEG→JPG PNG→PDF TIFF→smaller JPG→PDF PDF→PNG OGG→smaller PDF→JPG HEIC→WebP Opus→smaller MP4→WebP PDF→DOCX 7Z→smaller DOCX→PDF JPEG→WebP ODT→smaller WebP→JPEG PNG→GIF TAR.GZ→smaller JPG→GIF GIF→PNG ODS→smaller GIF→JPG MP4→MOV ODP→smaller MOV→MP4 WebP→PDF TAR.BZ2→smaller HEIC→JPEG WebP→GIF TAR.XZ→smaller GIF→WebP HEIC→PDF MP3→WAV WAV→MP3 JPEG→PDF PDF→JPEG SVG→PNG SVG→JPG HEIC→GIF MOV→MP3 MP4→GIF GIF→MP4 JPEG→GIF GIF→JPEG PNG→AVIF JPG→AVIF AVIF→PNG AVIF→JPG MP3→M4A M4A→MP3 GIF→PDF SVG→PDF PNG→SVG JPG→SVG PDF→SVG SVG→WebP MOV→WebP MP4→WAV MP4→WebM WebM→MP4 WebP→AVIF AVIF→WebP WebP→SVG SVG→JPEG MP4→MKV MKV→MP4 HEIC→AVIF MP4→M4A JPEG→AVIF AVIF→JPEG JPEG→SVG MOV→GIF GIF→MOV WebM→MP3 AVIF→PDF MP3→FLAC FLAC→MP3 MP4→AVI AVI→MP4 MKV→MP3 GIF→AVIF AVIF→GIF SVG→GIF GIF→SVG WebM→WebP MOV→WAV XLSX→PDF CSV→PDF EPUB→PDF PDF→EPUB MOV→WebM WebM→MOV MKV→WebP PNG→ICO JPG→ICO ICO→PNG ICO→JPG MP3→AAC WAV→M4A M4A→WAV MP4→FLAC AVI→MP3 MOV→MKV MKV→MOV MOV→M4A DOCX→EPUB EPUB→DOCX CSV→DOCX

Compress AAC

Make AAC files smaller without visible quality loss. Free, and your files never leave your browser.

Runs in your browser
Same format, smaller file
Batch & ZIP download

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.

What compression does to AAC

LossyIn your browser

Re-encodes AAC at a lower bitrate.

Light: A high bitrate: indistinguishable from the original for most listeners.
BalancedDefault: 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

Need an exact size?

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

AAC · Advanced Audio Coding

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

Type: Audio
Extension: .aac
MIME: audio/aac
Best for: streaming, mobile audio and video soundtracks

Lossy compression

All AAC conversions →

Compress other audio files

All audio files →

Compressing AAC: frequently asked questions

Free, private and in your browser

Smaller AAC files, in seconds.

No sign-up, no watermark, no upload. Drop a file and get it back lighter.

Compress a file All compress tools

Most conversions never leave your device
Cloud files deleted automatically
No watermarks