Convert M4A to AC3

Tested on Windows 11, 24 October 2026

Convert M4A audio to AC3 in your browser or in the Filoshi app for Windows. AC3 is lossy: Filoshi uses a high-quality setting, and you can choose the bitrate. Nothing is uploaded.

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

How to convert M4A to AC3 in your browser

  1. 1
    Drop your M4A file
    Drag it onto Filoshi above, or press Choose your M4A file to pick it on your computer.
  2. 2
    Filoshi converts it
    AC3 is chosen already. FFmpeg, compiled to WebAssembly, converts it inside this browser tab.
  3. 3
    Save your AC3 file
    Download it when it is ready. Nothing was sent to a server.
Source format

What is M4A?

MPEG-4 Audio (.m4a). M4A is an MP4 file that holds only audio, normally AAC (sometimes Apple Lossless). It is what iTunes, Apple Music downloads without DRM and iPhone voice memos use.

Common use: Apple Music and iTunes, voice memos, podcasts

Output format

What is AC3?

Dolby Digital (AC-3) (.ac3). AC-3, sold as Dolby Digital, is the lossy surround-sound format of DVDs, many Blu-ray discs and digital TV, with up to 5.1 channels. Home cinema receivers decode it; music players often do not.

Common use: Film and TV surround sound

Questions about M4A to AC3

Is converting M4A to AC3 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 M4A to AC3 lose quality?
Yes, a little. AC3 is a lossy format, so some detail is thrown away when the file is saved. Filoshi uses a high-quality setting by default, and you can choose the bitrate in the file viewer. M4A is lossy too, so this is a second round of compression; convert from the original, not from earlier conversions.
Is my M4A file uploaded anywhere?
No. The converter on this page runs in your browser with FFmpeg compiled to WebAssembly; your M4A file is read and converted on your device and never sent to a server. The desktop app works the same way, offline.
Has M4A to AC3 been tested?
Yes. M4A to AC3 is one of the 1,841 conversions that passed Filoshi's automated test matrix on Windows 11.
Can I convert many M4A files at once?
Yes, in the desktop app. Drop as many M4A files as you like on the window, pick AC3 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 M4A conversions

M4A to MP3M4A to AACM4A to OGGM4A to FLACM4A to OPUSM4A to AIFFM4A to AUM4A to CAF

Convert to AC3

MP3 to AC3WAV to AC3AAC to AC3OGG to AC3FLAC to AC3WMA to AC3OPUS to AC3AIFF to AC3

Need M4A to AC3 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