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AU to AAC converter

Convert AU to AAC for free, right in your browser. Your files never leave your device.

    Converted on your device · never uploaded · Free limits

    Where it runs
    On your device
    Free allowance
    Unlimited
    Typical time
    Usually under 5 seconds
    Sign-up
    Not needed

    What happens to your AU

    AAC is compressed, so the file becomes much smaller. At the default setting most listeners cannot hear a difference.

    This conversion runs inside your browser, so the file is never uploaded. Files over 400 MB are sent to our server instead, and deleted within 60 minutes.

    How to convert AU to AAC

    1. Choose your file Tap Choose files and pick the AU file, or drop it onto the page. You can add several at once.
    2. Convert to AAC The conversion starts on your device straight away. Nothing is uploaded.
    3. Download Tap Download to save the result.

    What is an AU file?

    A simple audio format from Sun and NeXT computers, still used by some Java and Unix tools.

    VLC, Audacity and QuickTime.

    More about AU files

    What is an AAC file?

    Raw AAC audio, the successor to MP3 used by YouTube, iTunes and most streaming services.

    VLC, iTunes, Android and most modern players open AAC.

    More about AAC files

    Questions

    Is converting AU to AAC free?

    Yes, completely. This conversion runs on your device, so there is no daily limit and no sign-up. We never ask you to pay after you have converted.

    Is it safe to convert my AU files here?

    Yes. The conversion happens inside your browser, and the file never leaves your phone or computer.

    How long does AU to AAC take?

    Usually under 5 seconds. Bigger files take longer, and you can watch the progress on each file.

    Can I convert AU to AAC on my iPhone or Android phone?

    Yes. The converter works in Safari, Chrome and any modern browser. Tap Choose files, pick from Photos or Files, and download the result to your phone.

    How do I open an AAC file?

    VLC, iTunes, Android and most modern players open AAC.

    Convert AU to other formats

    Convert other files to AAC