Convert MP3 to AC3

Tested on Windows 11, 24 October 2026

Convert MP3 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 MP3 to AC3 in your browser

  1. 1
    Drop your MP3 file
    Drag it onto Filoshi above, or press Choose your MP3 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 MP3?

MPEG Audio Layer III (.mp3). MP3 is the most widely supported audio format. It uses lossy compression: sound the ear is unlikely to notice is thrown away, so a song takes a few megabytes. Every phone, car stereo and music app plays it.

Common use: Music, podcasts, audiobooks and general audio sharing

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 MP3 to AC3

Is converting MP3 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 MP3 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. MP3 is lossy too, so this is a second round of compression; convert from the original, not from earlier conversions.
Is my MP3 file uploaded anywhere?
No. The converter on this page runs in your browser with FFmpeg compiled to WebAssembly; your MP3 file is read and converted on your device and never sent to a server. The desktop app works the same way, offline.
Has MP3 to AC3 been tested?
Yes. MP3 to AC3 is one of the 1,841 conversions that passed Filoshi's automated test matrix on Windows 11.
Can I convert many MP3 files at once?
Yes, in the desktop app. Drop as many MP3 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 MP3 conversions

MP3 to AACMP3 to OGGMP3 to FLACMP3 to M4AMP3 to OPUSMP3 to AIFFMP3 to AUMP3 to CAF

Convert to AC3

WAV to AC3AAC to AC3OGG to AC3FLAC to AC3M4A to AC3WMA to AC3OPUS to AC3AIFF to AC3

Need MP3 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