Convert MP3 to AU — lossless, so expect larger files
Free and unlimited, and nothing is uploaded: it all runs in your own browser. Open Audio Converter
What changes when you convert MP3 to AU
- MP3 audio is lossy and AU audio is lossless: converting cannot restore detail the source already discarded, and the AU audio file will usually be larger than the original.
How to convert MP3 to AU
- Add your MP3 file — drag it onto the page or choose it. It stays on your device.
- Pick AU as the output format.
- Press convert and download the result — individually or as one ZIP.
Questions
How do I convert MP3 to AU for free?
Add your MP3 file on this site, choose AU, and press convert. The whole conversion runs in your own browser — nothing is uploaded — and the AU file downloads straight from your device.
Will converting MP3 to AU lose quality?
MP3 audio is lossy and AU audio is lossless: converting cannot restore detail the source already discarded, and the AU audio file will usually be larger than the original.
Does AU keep everything MP3 supports?
Yes within the format’s own limits — pixels, timing and structure survive the conversion.