Convert AAC to AU
Fast, free AAC to AU conversion — works in any browser
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aac
Advanced Audio Coding (AAC)
| File extension | .aac |
|---|---|
| File category | audio |
| Programs | Apple iTunes VLC media player Windows Media Player Winamp foobar2000 |
| Tech description | https://en.wikipedia.org/wiki/Advanced_Audio_Coding |
| MIME type | audio/aac |
| Developer | AT&T Bell Labs, Fraunhofer IIS, Dolby, Sony |
AAC (Advanced Audio Coding) is a lossy audio compression format standardized by the MPEG group in 1997, designed as the successor to MP3. At the same bitrate, AAC delivers noticeably better audio quality thanks to improved psychoacoustic modelling, support for up to 48 audio channels, and sampling frequencies from 8 to 96 kHz. AAC is the default audio format on Apple devices, iOS, iTunes, and YouTube. Files typically use the .aac or .m4a extension. Developed jointly by AT&T Bell Labs, Fraunhofer IIS, Dolby, and Sony, AAC is natively supported on Android, iOS, Windows, macOS, and most modern media players.
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 AAC?
Upload your AU file, select AAC 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 AAC?
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 AAC 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 AAC without installing any app.
