Online AU Converter
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What is a AU file?
AU is a simple audio format developed by Sun Microsystems, originally for Unix systems. It was once common in early internet applications and multimedia software. AU files can contain various types of audio data, including uncompressed PCM or μ-law encoded samples.
Although largely outdated today, AU files are still supported by many open-source players and audio editors. They’re mostly found in old software archives and educational materials.
How to open AU files
AU files are supported by players like Audacity, VLC, and GoldWave. They're also readable by older UNIX-based systems and open-source software.
If you need a more universal format, convert AU to MP3 or WAV using AnyConv.
Key facts about AU
- Full name: Sun Audio File
- Extension: .au
- MIME type: audio/basic
- Developed by: Sun Microsystems
- Initial release: 1982
Useful links and resources
Convert from AU
Quickly turn your AU files into any format you need
Convert to AU
Easily turn your files into AU format
🎯 Did You Know?
The format that beeped through the early web
In the 1990s, AU files were among the first sounds heard online - tiny “Welcome!” clips or system beeps on early websites. Many were just seconds long, yet for dial-up users they made the web feel alive for the first time, turning simple audio into a digital novelty.
— Fact picked by Ethan Brooks
❓ Frequently Asked Questions
Answers to common questions about AU
- Do I need to install software to convert AU files?No extra software is required. Just upload your AU files to AnyConv, we’ll convert them on our servers, and you can download the finished file right away.
- Can I use AU converter on my phone or tablet?Yes, you can convert AU files on any device - including phones and tablets. AnyConv works perfectly on mobile.
- Is it safe to convert AU files with AnyConv?Yes, converting AU files with AnyConv is secure. All files are automatically deleted after conversion and never shared.
- Can I convert multiple AU files at once?Yes, our converter supports batch processing. You can upload several AU files and convert them all at once.