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.AU File Extension

2 file types use the .au file extension.

File Type 1Audacity Audio File

3.5 (21 Votes)
CategoryAudio Files

What is a AU file?

Audio file created by Audacity, a free, cross platform audio editor; uses a proprietary format that can only be opened by Audacity; saved as one of multiple audio data files for an Audacity project (.AUD).

More Information

When you created a project in Audacity and import audio files, the audio data is converted to the AU format and is stored in a folder with the project called myproject_data, where the project name is myproject.aud. When done editing a project, you can export the audio to several standard formats, including .MP3, .WAV, and .M4A.

NOTE: Audacity's AU format is not compatible with the standard AU audio file format.

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Programs that open AU files

Updated 3/23/2020

File Type 2Audio File

2.9 (11 Votes)
CategoryAudio Files

.AU File Association 2

Audio file introduced by Sun Microsystems; used primarily on Sun or other Unix-based machines and has been adopted by several audio programs, including Adobe Audition and QuickTime; stores the data in three parts: a header (24 bytes), a variable length annotation block, and the actual audio data.

Programs that open AU files

Updated 12/31/2014

About AU Files

Our goal is to help you understand what a file with a *.au suffix is and how to open it.

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