AAC Compressor
Better quality-per-kilobit than MP3 at the same bitrate.
Drop files, or click to browse
AAC, WAV, and other audio files welcome
Frequently asked questions
What bitrate should I pick?+
128 kbps is a good balance for speech and casual listening; 192–320 kbps preserves more detail for music.
Is my file uploaded to a server?+
No — compression runs locally using your browser's own built-in media codecs, in your browser tab.
Is there a maximum file size?+
There's no fixed file-size limit since nothing is uploaded to a server. Processing time scales with the track's length rather than a hard cutoff.
How do I compress a AAC?+
Drop your AAC into the box above and pick a bitrate — a smaller file is ready to download as soon as encoding finishes.
About AAC
What is AAC?
AAC is the compressed audio format behind iTunes, YouTube, and most streaming services — generally more efficient than MP3 at the same bitrate.
Full AAC format guide →A smaller AAC file means faster uploads, faster page loads, and fewer headaches with size limits on email or messaging apps. The tradeoff is a small, controllable amount of audio quality, which you can dial in yourself.
How it works
- 1
Drop your file in
Drag your audio onto the box above, or click it to browse — there's no account to create and no upload to wait on.
- 2
Adjust the slider
Drag the quality slider and watch the estimated file size update in real time.
- 3
Download the result
Your browser processes everything locally and hands you a download link the moment it's done — nothing was ever sent to a server.
Is it private?
Everything happens locally, inside this browser tab. Your audio is read from disk, processed with WebAssembly running on your own device, and handed back to you as a download — it's never transmitted anywhere, so there's nothing to intercept and nothing stored on a server.
Common use cases
- Music and podcasts on Apple devices
- Streaming
- Prepping a podcast episode for a hosting platform
- Fitting a voice memo under a messaging app's size limit
Supported formats
This is one of many pairings the audio toolkit handles. In total it covers:
Other compressors
Format details
About AAC files+
AAC is the compressed audio format behind iTunes, YouTube, and most streaming services — generally more efficient than MP3 at the same bitrate.
AAC (Advanced Audio Coding) was developed as the designated successor to MP3 under the MPEG standard, using newer compression techniques to squeeze out noticeably better sound quality at the same bitrate, or an equivalent quality at a smaller file size. Apple adopted it as the default format across iTunes and the iPhone early on, and it's since become the standard codec behind most video and streaming platforms as well, since it handles the low bitrates needed for streaming particularly well.
How to open a AAC file
Opens readily in Any modern media player, Any web browser, iTunes/Apple Music. For real editing, use Audacity (free), Adobe Audition.
Good for
- better quality-per-kilobit than MP3
- the default format across Apple's ecosystem
Watch out for
- slightly less universal hardware support than MP3, though still very broad
Need another format? Try the full Audio Compressor, or explore all audio tools.