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MP3 is one of the most widely used audio formats, offering lossy compression with good sound quality and small file size. It revolutionized music distribution and remains the standard for digital music playback across nearly all platforms and devices.
AU is a simple audio format developed by Sun Microsystems, mainly for use on Unix systems. It supports both uncompressed and compressed audio data. Though outdated, AU files may still be found in older applications and systems.
Convert your .mp3 files to .au right in your browser — no downloads, no installs. Everything happens securely in the cloud.
We never store your files permanently. Only you can access them, and they’re automatically deleted from our servers within 2 hours.
Turn your MP3 files into AU in just a couple of clicks. No registration, no limits — and it’s 100% free.