Convert AU to M4R
Fast, free AU to M4R conversion — works in any browser
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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.
m4r
M4R: the ringtone file used in Apple iOS
| File extension | .m4r |
|---|---|
| File category | audio |
| Programs | Apple iTunes GarageBand Audacity |
| Tech description | https://en.wikipedia.org/wiki/M4A |
| MIME type | audio/x-m4r |
| Developer | Apple Inc. |
The M4R format is used on Apple's mobile devices, mostly for storing ringtones. You can create an M4R file by converting other formats or downloading it from the iTunes Store. M4R is based on the standardized MPEG-4 format and is commonly encoded with AAC audio. One of its strengths is good sound quality at a small file size.
FAQ
How to convert M4R to AU?
Upload your M4R file, select AU 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 M4R to AU?
Most M4R 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 M4R files online?
Yes. All uploaded M4R files and converted AU results are automatically deleted from our servers within 1 hour after conversion. We do not store, share, or access your files.
Can I convert M4R 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 M4R file and convert to AU without installing any app.
