Tools / File Converter / MP3 to AU Converter

MP3 to AU Converter

Convert MP3 files to AU. Free, without uploading.

This tool converts MP3 files to AU. MP3 is the most common audio format. It uses lossy compression and plays on almost every device.

Sun/NeXT audio. AU is lossless, so the audio keeps the quality it has in the MP3 file.

Conversion runs on your device; your file is never sent to a server. The components download once on first use, and later conversions start right away.

How to use

1. Choose the MP3 file, drag it in, or paste its link.
2. Choose the audio quality; optionally enter a start and end time.
3. Press "Convert" and download the AU file.

Frequently asked questions

Will audio quality drop when converting to AU?

No. AU is lossless.

Is there a file size limit?

No fixed limit; your device’s memory decides. Computers usually handle files up to 1–2 GB.

Is my file uploaded?

No. Your MP3 file is converted to AU inside your browser.