AU File - opening and understanding

Did your computer fail to open an AU file? We explain what they are used for and recommend software that we know can open or otherwise handle your .AU files.

What is an AU file?

An .AU file is an Audacity audio block file. Files with the .au file extension are audio files stored in a file format used by Audacity, a sound editor software.

The .au files are part of an Audacity project, and these files are used while working on the project. After editing, the finished sound data is exported to a common audio format like MP3.

How to open AU files

You will need a program compatible with the specific file you are trying to open, as different programs may use files with file extension AU for different purposes. We have identified 1 AU opener for Windows that is compatible with this specific type of AU file.

Programs that open these files

AudacityAudacityVerified
We have not yet verified any programs for Mac that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!
We have not yet verified any web services that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!

Other file formats using extension .AU

While Audacity audio block is a popular type of AU-file, we know of 2 different uses of the .AU extension.

The AU file extension indicates to your device which app can open the file. However, different apps may use the same file extension for different types of data. So an AU opener may not be able to open all kinds of AU files. In this case, look through both formats to make sure you find the best suited AU viewer.

NeXT/Sun uLaw/AUdio format

Old, simple audio file format introduced by Sun Microsystems. The format was common on NeXT and SPARCstation systems.

This format is obsolete, and you are only likely to come across this type of .au file if you work with preserving legacy software systems.

While we have not verified the apps ourselves yet, our users have suggested 10 different AU openers which you will find listed below.

Various viewers for this file format

These apps are known to open certain types of AU files. Remember, different programs may use AU files for different purposes, so you may need to try out a few of them to be able to open your specific file.

WavePad Sound EditorWavePad Sound EditorUser submitted
Any Video ConverterAny Video ConverterUser submitted
Final Media PlayerFinal Media PlayerUser submitted
Free File ViewerFree File ViewerUser submitted
WavePad Audio-EditorWavePad Audio-EditorUser submitted
Switch Sound File ConverterSwitch Sound File ConverterUser submitted
QuickTimeQuickTimeUser submitted
VideoLAN VLC media playerVideoLAN VLC media playerUser submitted
Microsoft Windows Media PlayerMicrosoft Windows Media PlayerUser submitted
RealPlayerRealPlayerUser submitted
We have not verified any software that we know for certain will work with AU-files on Mac. If you know one, please use the 'Suggest a program' link below and tell us about it!
We have not verified any web services that we know for certain will work with AU-files. If you know one, please use the 'Suggest a program' link below and tell us about it!