Convert CAF to AU
Fast, free CAF to AU conversion — works in any browser
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caf
Core Audio Format
| File extension | .caf |
|---|---|
| File category | audio |
| Programs | Apple QuickTime Player Apple iTunes VLC media player Audacity |
| Tech description | https://en.wikipedia.org/wiki/Core_Audio_Format |
| MIME type | audio/x-caf |
| Developer | Apple Inc. |
This audio file container was created by Apple's developers. CAF can store a lot of information: the artist's name, song duration, album and track names, and more. In terms of size, CAF files can exceed 4 GB. Since its introduction in 2005, the Core Audio Format has been used as an alternative to AIFF and WAV. It can use different codecs, so audio quality depends on the chosen encoding. CAF files are often used to store audio assets and sound effects.
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 CAF?
Upload your AU file, select CAF 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 CAF?
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 CAF 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 CAF without installing any app.


