AU to AIFF Converter

Convert AU (Sun/NeXT AU audio) files to AIFF online, for free, with nothing to install.

To convert AU to AIFF, select or drop your .au file above, check that AIFF is chosen as the output, and click Convert. This conversion runs on our server, and your files are deleted 72 hours later.

What is an AU file?

AU – Sun/NeXT AU audio. AU is the audio format of Sun and NeXT computers, simple and old; Unix tools and some programming libraries still read it. Converting makes a new file: the sound is decoded and written again, so converting from a lossy format never brings back what was lost.

AU Converter →

What is an AIFF file?

AIFF – AIFF audio. AIFF is Apple's uncompressed audio format, the Mac counterpart of WAV: every sample is kept. Converting makes a new file: the sound is decoded and written again, so converting from a lossy format never brings back what was lost.

AIFF Converter →

How to convert AU to AIFF

  1. Click Select File, or drop your .au files anywhere on this page. You can add several at once.
  2. Check that AIFF is chosen as the output format. On this page it is picked for you.
  3. Click Convert. When a file has to go to our server, the button says Upload and convert instead.
  4. Click Download next to each file when it's done.

AU vs AIFF: how they compare

AUAIFF
LayoutA stream of soundA stream of sound
EditableIn audio editorsIn audio editors
Created bySun Microsystems, 1992Apple, 1988
Best forUnix programs and scientific toolsAudio editing on a Mac

Good to know

  • The sound is decoded and written as an AIFF file, every sample kept.
  • Tags such as title and artist are kept where the new format has room for them. Only the first audio track is converted; pictures and video are left out.

Frequently asked questions

Is converting AU to AIFF free?

Yes. Everyone gets 25 free credits a day, with no account needed. Conversions on our server use one credit per started minute of work, so most cost a single credit. Credits reset at midnight UTC.

Are my AU files uploaded anywhere?

This conversion runs on our server, because converting audio needs ffmpeg, which does not run in a browser. Your file is sent over an encrypted connection, and both it and the result are deleted 72 hours after the conversion. The server has no internet access while it works on your file.

How large can the AU file be?

Up to 1 GB per file. This conversion runs on our server, which accepts files up to that size.

Will the AIFF look the same as the AU?

Yes for the sound: every sample is kept, and tags such as title and artist are kept where AIFF has room for them.

Can I convert several AU files at once?

Yes. Add as many files as you like; they are converted one after another, and each one gets its own Download button.

How long does converting AU to AIFF take?

In our tests a one-hour WAV recording became an M4A file in about 46 seconds. A song of a few minutes takes a few seconds, and most conversions cost a single credit.

Convert AU to other formats

Convert other files to AIFF

All audio formats

Updated