AU is Sun Microsystems' classic Unix audio format, one of the earliest sound formats, still seen in old Unix and Java applications.
AU plays in VLC and Audacity; convert to MP3/WAV for everyday use.
Listening on any device or app.
Production-quality source audio.
Lightweight recordings to share.
| ✔ Strengths | ✖ Limitations |
|---|---|
| Excellent compatibility | No transparency support |
| Limited support — may need converting |
Remove the background from AU images, upscale to 4K, or generate new visuals with SharkFoto AI.
AU is Sun Microsystems' classic Unix audio format, one of the earliest sound formats, still seen in old Unix and Java applications.
AU plays in VLC and Audacity; convert to MP3/WAV for everyday use.
AU is optimised for its specific use rather than strictly lossless storage.
Use SharkFoto's free tools — upload your AU file and convert it to a more convenient format in seconds. It's free, processed securely and never stored.
No — AU doesn't store transparency; convert to PNG or WEBP if you need it.