Convert MP3 to AU
Fast, free MP3 to AU conversion — works in any browser
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mp3
MP3 (MPEG-1 Audio Layer 3)
| File extension | .mp3 |
|---|---|
| File category | audio |
| Programs | Windows Media Player VLC media player MPlayer jetAudio Zune Audacity Apple iTunes Plex Media Center Amarok Xine Totem |
| Tech description | https://en.wikipedia.org/wiki/MP3 |
| MIME type | audio/mp3 |
| Developer | Fraunhofer Society |
MP3 (MPEG-1 Audio Layer 3) is a lossy audio compression format developed by Fraunhofer IIS in Germany and standardized in 1993. It achieves compression ratios up to 10:1 by removing audio data deemed imperceptible by the human ear, using a psychoacoustic model. Users can set the bitrate — typically 128 to 320 kbps — to balance file size and audio quality. MP3 is the world's most universally supported audio format, compatible with virtually every media player, smartphone, smart TV, and car audio system. Despite newer alternatives like AAC and Opus offering better quality at the same bitrate, MP3 remains the standard for music distribution and storage.
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 MP3?
Upload your AU file, select MP3 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 MP3?
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 MP3 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 MP3 without installing any app.
