Audio tool

Convert AU Files to MP3 on Your Device

Convert AU to MP3 in your browser for easy sharing. The source remains on your device throughout local processing. Ready for delivery.

Route AU → MP3

or drop here · up to 500 MB

Max 50 MB per file

Preview (optional)

When your browser supports it, your audio plays here. You can still convert your file if preview does not load.

Ready

Use upload name

Adapt legacy workstation exchange to a workflow built for easy sharing
Supply MP3 when an editor, player, or delivery form will not accept AU
Create a MP3 copy from AU for phones, websites, podcasts, and universal playback

Encoding speed depends on the processor available to this tab during this AU-to-MP3 job.
A short AU sample is quicker to process than a full-length recording.
Check picture, sound, and timing in MP3 before removing the source.

MP3 serves phones, websites, podcasts, and universal playback, whereas AU commonly serves Unix workstations and older audio software.
For AU-to-MP3 delivery, plan for quality loss from further lossy encoding.
After leaving AU, the receiving app must support the streams encoded inside MP3, not only its extension.

AU to MP3 taking too long? Reduce other processor activity and leave the page open until completion.
MP3 converted from AU not opening? Test a compatible player and inspect the output streams.
Inspect the generated streams when an app recognizes MP3 but refuses playback.

When does AU to MP3 conversion make sense?

It is useful when AU media created for legacy workstation exchange must enter a MP3 system designed for easy sharing.

Where is the AU source processed?

The browser prepares MP3 from AU on this device instead of sending the source to a remote conversion server.

How can I approve MP3 converted from AU?

Test the MP3 file in the receiving app and compare duration, channels and loudness with the AU source.

Quick use cases