The au file extension is related to the Audacity an audio editor. The *.au file stores audio block.

There is one other file type using
the AU file extension!

au file - Unix audio sound file format

Detailed description

Software that works with au file extension

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AU file extension - Audacity audio block file

What is au file? How to open au files?

File type specification:

Audio and sound file type icon Audio and sound file type

au file icon: au filetype icon

The au file extension is associated with Audacity audio editing application. Behind the scenes, large audio files are broken up into chunks of just over a megabyte in size, which Audacity calls block files with au file extension. The Audacity *.au files are not compatible with *.au Unix audio files.

The default software associated to au file type:

Audacity icon

Audacity logo Audacity  Microsoft Windows software

Company or developer:

Audacity is a free, open source software for recording and editing sounds. It is available for Mac OS X, Microsoft Windows, GNU/Linux, and other operating systems.

Audacity is able to:

  • Record live audio.
  • Record computer playback on any Windows Vista or later machine.
  • Convert tapes and records into digital recordings or CDs.
  • Edit WAV, AIFF, FLAC, MP2, MP3 or Ogg Vorbis sound files.
  • AC3, M4A/M4R (AAC), WMA and other formats supported using optional libraries.
  • Cut, copy, splice or mix sounds together.
  • Numerous effects including change the speed or pitch of a recording.

Audacity for Mac icon

Audacity logo Audacity for Mac  Apple macOS / Mac OS X software

Company or developer:

Audacity for Mac is free multi-track audio editing tool that allows users to record live audio, convert old tapes to modern formats, edit various audio file types, cut, copy, mix audio data and adds various effects, like change speed of audio etc.

Help how to open AU files:

Use Audacity to open .au audio block files.

How to convert file with extension AU:

Currently there is no specific information available, about how to convert this sound file type.

For general information try to look at:
Basic info how to convert audio files

List of software applications associated to the .au file extension

Recommended software programs are sorted by OS platform (Windows, Mac OS X etc.) and possible program actions
that can be done with the file
: like open au file, edit au file, convert au file, view au file, play au file etc. (if exist software for corresponding action in's database).

Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting of the au files.

  • Play au file
  • Create au file
  • Export au file
  • Others au file

au file players - programs that can play au file - Audacity audio block file

Click on the link to get more information about listed programs for play au file action.

Microsoft Windows:

Apple macOS / Mac OS X:


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