How to use the AU converter
- Choose a file. Drop an AU file to convert it to something else, or any other audio file to convert it to AU.
- Check "Convert to". The converter picks MP3 for AU files and AU for everything else; change it if you need something different.
- Adjust quality if you want a smaller or higher-quality file.
- Click Convert and download the result.
What is an AU file?
AU (also .snd) is a simple audio format from Sun and NeXT workstations. It is still used by Java applets, some Unix tools and older sound-effect collections.
AU is mainly used for Java and Unix software, old sound effects. It plays on VLC, Audacity and Java; few phones and modern players.
AU at a glance
| Full name | Sun/NeXT Audio |
|---|---|
| Type | Audio |
| Created by | Sun Microsystems, 1992 |
| Compression | Uncompressed |
| Codec | PCM or μ-law |
| Can be created here | Yes |
Pros and cons of AU
Good
- Very simple format
Not so good
- Rarely supported today
Common AU problems and fixes
An AU file will not open
Convert AU to MP3 or WAV.
Frequently asked questions
How do I open an AU file?
AU files play on VLC, Audacity and Java; few phones and modern players. If yours will not open, convert it to MP3 on this page; that format plays on any device.
How do I convert a file to AU?
Drop any audio file on this page. "Convert to" is set to AU automatically for files that are not AU already.
Do I have to pay or sign up to use the AU converter?
No. There is no account, no payment and no watermark. The only limit is 1 GB per file, set by what browsers can handle.
Are my files safe?
Yes. Files are converted locally in your browser and are never uploaded. When you close the page, nothing is left behind.
Is AU lossless?
No, AU is uncompressed, so it keeps the full original quality.