MP3 to AU Converter

Select files for conversion or just drag and drop them to the upload area

How to convert MP3 files to AU online?

Step 1.

Upload MP3-file

Click "Choose File" button to select a mp3 file on your computer. MP3 file size can be up to 50 Mb.
Step 2.

Convert MP3 to AU

Click "Convert" button to start conversion.
Step 3.

Download your AU

When the conversion process is complete, you can download the AU file.


  • ❓ How can I convert MP3 to AU?
    First you need to add file for conversion: drag and drop your MP3 file or click the "Choose File" button. Then click the "Convert" button. When MP3 to AU conversion is completed, you can download your AU file.
  • ⏱️ How long does it take to convert MP3 to AU?
    Audio conversion is pretty fast. You can change MP3 to AU in a few seconds.
  • 🛡️ Is it safe to convert MP3 to AU on AnyConv?
    Of course! We delete uploaded files immediately, and converted ones after 24 hours. No one has access to your files. File conversion (including MP3 to AU) is absolutely safe.
  • 💻 Can I convert MP3 to AU on Mac OS or Linux?
    Yes, you can use AnyConv on any operating system that has a web browser. Our MP3 to AU converter works online and does not require software installation.

Information about MP3 and AU file formats

Name MP3 AU
Full name MP3 - MPEG-1 or MPEG-2 Audio Layer III Sun Microsystems AU files
File extension .mp3 .au
MIME type audio/mpeg, audio/MPA, audio/mpa-robust audio/basic
Developed by Fraunhofer Institute Sun Microsystems
Type of format Digital audio
Description MPEG-1 or MPEG-2 Audio Layer III, more commonly referred to as MP3, is an audio coding format for digital audio which uses a form of lossy data compression. It is a common audio format for consumer audio streaming or storage, as well as a de facto standard of digital audio compression for the transfer and playback of music on most digital audio players. The AU file format is a simple audio file format introduced by Sun Microsystems. AU format was common on NeXT systems and on early Web pages. Originally it was headerless, being simply 8-bit μ-law-encoded data at an 8000 Hz sample rate. Hardware from other vendors often used sample rates as high as 8192 Hz. Newer AU files have a header that consists of six unsigned 32-bit words.
Technical details The use of lossy compression is designed to greatly reduce the amount of data required to represent the audio recording and still sound like a faithful reproduction of the original uncompressed audio. An MP3 file that is created using the setting of 128 kbit/s will result in a file that is about 1/11 the size of the CD file created from the original audio source.
File conversion MP3 conversion AU conversion
Associated programs VLC media player, MPlayer, Winamp, foobar2000. Nullsoft Winamp, Apple QuickTime Player, Microsoft Windows Media Player, RealNetworks RealPlayer Cloud, Adobe Audition CC
MP3 to AU conversion quality rating:
4.8 (1471 votes)
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