Convert MP4 to AC3
Pull the soundtrack out of any MP4 video and save it as AC3 in seconds. Conversion happens inside your browser, so even large or private videos are never uploaded.
Drop MP4 files here
MP3, WAV, FLAC, M4A, OGG, OPUS, AAC, AIFF, WMA, AMR, MP4, MOV & more · Processed on your device - nothing is uploaded
How to convert MP4 to AC3
- Click "Choose files" or drag your MP4 videos onto the page.
- Make sure "AC3" is selected as the output format (384 kbps is a good default).
- Optionally click Edit to trim, adjust volume or add effects.
- Click Convert, then Download your AC3 files.
Why convert MP4 to AC3?
AC3 files are much smaller than video and play on any music player, phone or car stereo.
AC3 is best for DVD authoring, home theatre and video production. DVD/Blu-ray players, AV receivers, smart TVs, VLC.
Will I lose quality?
The audio is decoded from the MP4 video and encoded to AC3. Choose a lossless format (WAV/FLAC) for zero loss, or a high bitrate for AC3.
MP4 vs AC3
| MP4 | AC3 | |
|---|---|---|
| Full name | MPEG-4 Video | Dolby Digital (AC-3) |
| Type | video | lossy |
| Best for | videos from phones, YouTube and social media | DVD authoring, home theatre and video production |
| Typical size | varies | ~2.9 MB at 384 kbps per minute |
| Compatibility | Universal video format. | DVD/Blu-ray players, AV receivers, smart TVs, VLC. |
| Developed by | - | Dolby Laboratories (1991) |
MP4 to AC3: questions
How do I convert MP4 to AC3?
Open this page, add your MP4 file, make sure AC3 is selected as the output format and click Convert. Your AC3 file is ready to download in seconds.
Will converting MP4 to AC3 lose quality?
The audio is decoded from the MP4 video and encoded to AC3. Choose a lossless format (WAV/FLAC) for zero loss, or a high bitrate for AC3.
Is this MP4 to AC3 converter free and safe?
Yes. It's free with no watermark or sign-up. Files are processed locally in your browser, so your audio is never uploaded or stored on our servers.
Can I convert many MP4 files to AC3 at once?
Yes - add up to 5 files at a time on the free plan (unlimited with Pro), convert them all with one click and download them as a ZIP.
What is the difference between MP4 and AC3?
MP4 (MPEG-4 Video) is a video format, the most common video format. We extract its soundtrack so you can save just the audio. AC3 (Dolby Digital (AC-3)) is a compressed (lossy) format: dolby Digital surround-sound audio used on DVDs, Blu-rays and TV broadcasts.
Does it work on Mac, Windows, iPhone and Android?
Yes. The MP4 to AC3 converter runs in any modern browser - Chrome, Safari, Edge or Firefox - on desktop and mobile. No software to install.