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M4A to AU converter

Convert M4A to AU for free, with no sign-up and no paywall after upload.

    Converted on our server · deleted after 60 min · Free limits

    Where it runs
    Our server, files deleted in 60 min
    Free allowance
    25 files a day, up to 200 MB each
    Typical time
    Usually under a minute
    Sign-up
    Not needed

    What happens to your M4A

    AU is lossless, but it cannot restore quality the M4A file already lost. Expect a larger file that sounds the same.

    This conversion runs on our server. Your file is deleted within 60 minutes, and you can delete it yourself as soon as you have downloaded the result.

    How to convert M4A to AU

    1. Choose your file Tap Choose files and pick the M4A file, or drop it onto the page. You can add several at once.
    2. Convert to AU Tap Convert. The file is sent over an encrypted connection and converted on our server.
    3. Download Tap Download to save the AU file. It is deleted from our server within 60 minutes, or straight away if you tap Delete.

    What is an M4A file?

    Apple's standard audio container, usually holding AAC audio. It sounds better than MP3 at the same size and is what iPhone voice memos and iTunes use.

    iPhone, Mac, Windows Media Player, VLC and Android play M4A.

    More about M4A files

    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

    Questions

    Is converting M4A to AU free?

    Yes. You can convert up to 25 files a day on our server for free, each up to 200 MB, with no sign-up. The limit is shown before you upload, and we never ask you to pay to download a file you have already converted.

    Is it safe to convert my M4A files here?

    Yes. Files travel over an encrypted connection, are processed on our own server, and are deleted within 60 minutes. Nobody looks at them, and you can delete them yourself straight after downloading.

    How long does M4A to AU take?

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

    Can I convert M4A to AU 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 AU file?

    VLC, Audacity and QuickTime.

    Convert M4A to other formats

    Convert other files to AU