Convert M4A to AU
Fast, free M4A to AU conversion — works in any browser
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m4a
M4A — MPEG-4 Audio File
| File extension | .m4a |
|---|---|
| File category | audio |
| Programs | Apple iTunes VLC media player Windows Media Player foobar2000 Winamp |
| Tech description | https://en.wikipedia.org/wiki/M4A |
| MIME type | audio/mp4 audio/x-m4a |
| Developer | Apple Inc. |
M4A is an audio-only file container based on the MPEG-4 standard, introduced by Apple in 2004. The .m4a extension distinguishes audio-only files from .mp4 files that contain video. M4A files are most commonly encoded with the AAC codec, offering better audio quality than MP3 at the same file size. Lossless encoding using Apple Lossless (ALAC) is also possible within the M4A container. M4A is the default format for music purchased from the iTunes Store and Apple Music. It is natively supported on all Apple devices, and plays on Android, Windows, macOS, VLC, foobar2000, and Windows Media Player.
au
AU format for reliable data storage
| File extension | .au .snd |
|---|---|
| File category | audio |
| Programs | VLC media player Audacity MPlayer Xine Sox |
| Tech description | https://en.wikipedia.org/wiki/Au_file_format |
| MIME type | audio/basic audio/au |
| Developer | Sun Microsystems |
This audio format was developed by Sun Microsystems. It is intended for storing audio files; the file itself consists of three components: the header, the annotation unit, and the audio file itself. What distinguishes this format is the small file size, due to which its sound quality is low. It can be converted into other formats, such as mp3 or MPEG. Although this format is mostly used on personal computers that are powered by operating systems Sun or Unix, AU files can also be opened using other audio players.
FAQ
How to convert AU to M4A?
Upload your AU file, select M4A as the output format, and click Convert. The converted file will be ready to download in seconds — no account or installation required.
How long does it take to convert AU to M4A?
Most AU files convert in seconds. Larger files may take up to a few minutes depending on size and internet speed. You can track the progress bar in real time during conversion.
Is it safe to convert AU files online?
Yes. All uploaded AU files and converted M4A results are automatically deleted from our servers within 1 hour after conversion. We do not store, share, or access your files.
Can I convert AU on iPhone or Android?
Yes, our converter works on all devices and operating systems — iPhone, iPad, Android, Windows, and macOS. Open the site in your mobile browser, upload the AU file and convert to M4A without installing any app.
