Convert AU to MP3
MP3 is smaller, at the cost of some detail.
They open in the converter with MP3 selected.
Browse filesFiles stay on your device.
What changes
AU is lossless and MP3 is lossy, so some quality is lost: it shows in the high end and in sharp hits such as cymbals or claps.
The file gets smaller: MP3 stores the same content in less space.
How big the MP3 will be
At 192 kbps, 4 min of MP3 take 5.8 MB.
When it’s worth it
Choose MP3 for: Music, podcasts, and everyday sharing. Small files that play on almost anything.
Stay with AU for: Older audio archives and specialist tools.
How to convert AU to MP3
- Drop the AU files on this page, or browse for them. Up to 200 at once.
- The converter opens with the files loaded and MP3 selected.
- Press Convert, then save each file or all of them as a ZIP.
Questions
Does converting AU to MP3 lose quality?
Yes. MP3 is a lossy format, so some detail is lost.
What is the MP3 format?
A lossy codec where the audio is cut down by removing sounds the ear can’t hear, so a track keeps a reasonable size at a typical bitrate. It’s still the most widely playable audio format, which is why it’s the default for sharing music.
What is the AU format?
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.
Are the files uploaded?
No. The file is opened in this tab, converted here and saved from here. There’s no account and no watermark.
How many files can be converted at once?
Up to 200 per batch and about 2 GB per file, within the memory this device has available.