AU to MP3 Converter

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

How to convert AU files to MP3 online?

Step 1.

Upload AU-file

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

Convert AU to MP3

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

Download your MP3

When the conversion process is complete, you can download the MP3 file.


  • ❓ How can I convert AU to MP3?
    First you need to add file for conversion: drag and drop your AU file or click the "Choose File" button. Then click the "Convert" button. When AU to MP3 conversion is completed, you can download your MP3 file.
  • ⏱️ How long does it take to convert AU to MP3?
    Audio conversion is pretty fast. You can change AU to MP3 in a few seconds.
  • 🛡️ Is it safe to convert AU to MP3 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 AU to MP3) is absolutely safe.
  • 💻 Can I convert AU to MP3 on Mac OS or Linux?
    Yes, you can use AnyConv on any operating system that has a web browser. Our AU to MP3 converter works online and does not require software installation.

Information about AU and MP3 file formats

Name AU MP3
Full name Sun Microsystems AU files MP3 - MPEG-1 or MPEG-2 Audio Layer III
File extension .au .mp3
MIME type audio/basic audio/mpeg, audio/MPA, audio/mpa-robust
Developed by Sun Microsystems Fraunhofer Institute
Type of format Digital audio
Description 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. 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.
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 AU conversion MP3 conversion
Associated programs Nullsoft Winamp, Apple QuickTime Player, Microsoft Windows Media Player, RealNetworks RealPlayer Cloud, Adobe Audition CC VLC media player, MPlayer, Winamp, foobar2000.
AU to MP3 conversion quality rating:
4.3 (182 votes)
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