AU is the audio format of Sun and NeXT computers, simple and old; Unix tools and some programming libraries still read it. Converting makes a new file: the sound is decoded and written again, so converting from a lossy format never brings back what was lost. AU files can be saved as AAC, AIFF, FLAC, M4A, MP3, WAV, WMA, on our server.
What is an AU file?
AU – Sun/NeXT AU audio. AU is the audio format of Sun and NeXT computers, simple and old; Unix tools and some programming libraries still read it. Converting makes a new file: the sound is decoded and written again, so converting from a lossy format never brings back what was lost.
How to convert an AU file
- Click Select File, or drop your .au files anywhere on this page.
- Pick the format you want next to each file, for example AAC.
- Click Convert, then Download when it's done.
AU at a glance
| AU | |
|---|---|
| Layout | A stream of sound |
| Editable | In audio editors |
| Created by | Sun Microsystems, 1992 |
| Best for | Unix programs and scientific tools |
Frequently asked questions
What is an AU file?
AU is the audio format of Sun and NeXT computers, simple and old; Unix tools and some programming libraries still read it. Converting makes a new file: the sound is decoded and written again, so converting from a lossy format never brings back what was lost.
How do I open an AU file?
Most media players open AU files: VLC plays almost every audio format, and the player on your phone or computer handles the common ones. To read it anywhere, convert it to MP3 here.
Is converting AU files free?
Yes. Everyone gets 25 free credits a day, with no account needed. Conversions on our server use one credit per started minute of work, so most cost a single credit. Credits reset at midnight UTC.
Are my AU files uploaded anywhere?
This conversion runs on our server, because converting audio needs ffmpeg, which does not run in a browser. Your file is sent over an encrypted connection, and both it and the result are deleted 72 hours after the conversion. The server has no internet access while it works on your file.
Convert AU to
- AU to AAC Converter
- AU to AIFF Converter
- AU to FLAC Converter
- AU to M4A Converter
- AU to MP3 Converter
- AU to WAV Converter
- AU to WMA Converter
Other audio converters
- Audio Converter
- MP3 Converter
- WAV Converter
- M4A Converter
- FLAC Converter
- AAC Converter
- M4B Converter
- OGA Converter
- OPUS Converter
- WEBA Converter
- WMA Converter
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