Convert ALAC to AU

Tested on Windows 11, 24 October 2026

Convert ALAC audio to AU in your browser or in the Filoshi app for Windows. AU stores the decoded audio without further loss. Nothing is uploaded.

Get Filoshi · $29Many files at once, no size limit, on Windows.

How to convert ALAC to AU in your browser

  1. 1
    Drop your ALAC file
    Drag it onto Filoshi above, or press Choose your ALAC file to pick it on your computer.
  2. 2
    Filoshi converts it
    AU is chosen already. FFmpeg, compiled to WebAssembly, converts it inside this browser tab.
  3. 3
    Save your AU file
    Download it when it is ready. Nothing was sent to a server.
Source format

What is ALAC?

Apple Lossless Audio Codec (.alac). ALAC is Apple's lossless codec: like FLAC it decodes to exactly the original audio, at roughly half the size of WAV. Apple released it as open source in 2011; iTunes, Apple Music and iPhones play it natively.

Common use: Lossless music on Apple devices

Output format

What is AU?

Sun Audio (.au). AU is Sun Microsystems' simple audio format from early Unix workstations: a short header followed by samples, often 8-bit µ-law or linear PCM. It appears in old Unix software and early web sound clips.

Common use: Old Unix sounds and early web audio

Questions about ALAC to AU

Is converting ALAC to AU free?
Yes, one file at a time: the converter on this page runs in your browser, files up to 100 MB, no sign-up. The Filoshi desktop app ($29 once, for Windows) converts many files at once and has no size limit.
Does converting ALAC to AU lose quality?
No. Both ALAC and AU store audio without loss, so the converted file holds exactly the same sound; it may be larger, because AU is uncompressed.
Is my ALAC file uploaded anywhere?
No. The converter on this page runs in your browser with FFmpeg compiled to WebAssembly; your ALAC file is read and converted on your device and never sent to a server. The desktop app works the same way, offline.
Has ALAC to AU been tested?
Yes. ALAC to AU is one of the 1,841 conversions that passed Filoshi's automated test matrix on Windows 11.
Can I convert many ALAC files at once?
Yes, in the desktop app. Drop as many ALAC files as you like on the window, pick AU once for all of them, and each file shows its own progress. The new files appear next to the originals, which are never changed.

Related conversions

Other ALAC conversions

ALAC to MP3ALAC to AACALAC to OGGALAC to FLACALAC to M4AALAC to OPUSALAC to AIFFALAC to AC3

Convert to AU

MP3 to AUWAV to AUAAC to AUOGG to AUFLAC to AUM4A to AUWMA to AUOPUS to AU

Need ALAC to AU for many files?

The browser converter handles one file at a time. The Filoshi app for Windows converts as many as you drop, runs offline, and has 1,841 tested conversions.

Get Filoshi · $29