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.au Sun / NeXT Audio

AU Converter

AU is a simple uncompressed audio format from Sun Microsystems, still found on Unix systems and in Java applications.

  • No upload — 100% private
  • Fast, lossless when possible
  • Free & unlimited
  • Works on iPhone & Android

    Quality
    Advanced options
    Trim (optional)
    Use minutes:seconds, e.g. 1:05.5

    AU at a glance

    Full nameSun / NeXT Audio
    TypeAudio
    CompressionLossless
    Developed bySun Microsystems
    Introduced1992
    File extension.au
    Plays on iPhone✕ No
    Plays on Android◐ Partly / with an app
    Plays on Windows◐ Partly / with an app
    Plays on Mac✓ Yes

    AU is best for Unix systems and Java apps.

    Frequently asked questions

    What is a .au file?
    AU is a simple uncompressed audio format from Sun Microsystems, still found on Unix systems and in Java applications.
    How do I open a AU file?
    On a computer, VLC Media Player opens almost any .au file. On phones, the quickest fix is to convert it to MP3 or M4A above. Those formats play in every music app.
    Can I convert AU for free?
    Yes. The converter on this page is free and unlimited, and it works without uploading anything.