Audio tool

Convert FLAC Files to AU on Your Device

Convert FLAC to AU in your browser for legacy workstation exchange. The source remains on your device throughout local processing.

Route FLAC → AU

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

Processing demand varies with the codecs found in the source during this FLAC-to-AU job.
A short FLAC sample is quicker to process than a full-length recording.
Inspect the AU file in the exact player or editor that will receive it.

AU serves Unix workstations and older audio software, whereas FLAC commonly serves music archives, mastering, and lossless playback.
For FLAC-to-AU delivery, plan for limited modern consumer support.
After leaving FLAC, the receiving app must support the streams encoded inside AU, not only its extension.

FLAC to AU taking too long? Reduce other processor activity and leave the page open until completion.
AU converted from FLAC not opening? Test a compatible player and inspect the output streams.
Check whether the receiver supports this AU variant: limited modern consumer support.

When does FLAC to AU conversion make sense?

It is useful when FLAC media created for lossless distribution must enter a AU system designed for legacy workstation exchange.

Where is the FLAC source processed?

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

How can I approve AU converted from FLAC?

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

Quick use cases