Audio format
What is a .au file?
A Sun and NeXT audio format holding 8-bit linear PCM, one of the oldest audio containers still in use. It’s dead simple and uncompressed, which is why it survives in Unix toolchains and command-line audio tools.
fileclay opens and writes AU
When to use AU
- Best for
- Older audio archives and specialist tools.
- Advantages
- A simple header and raw sound, easy to read.
- Disadvantages
- Rare in modern workflows.
Convert AU files
From AU
All 18 output formats: .mp3, .wav, .m4a, .ogg, .aac, .flac, .opus, .oga, .m4b, .aiff, .aif, .wma, .ac3, .mka, .caf, .tta, .wv, .mp2
Conversions run in your browser. Files aren’t uploaded.
Questions about AU
How do I convert my files to .au?
Open the fileclay converter, drop your file in and pick .au as the output format. It runs inside your browser with WebAssembly, so nothing is uploaded, there’s no account and no watermark.
Which formats can I convert AU files into?
fileclay can write 19 formats from a AU file, including MP3, WAV, M4A, OGG, AAC and FLAC. Pick any of them as the output format when you drop the file in.
Is AU lossless?
Yes. AU keeps all the original data, so nothing is lost when the file is saved.