How to convert MP4 to AC3
To convert MP4 to AC3, upload your MP4 file, choose AC3 as the output format and press Convert. The finished AC3 file is ready to save to your phone or computer in seconds, free, with no watermark and no sign-up. Your file is deleted from our server about 30 minutes after the conversion.
This free online converter turns MP4 video files into AC3 in your browser, with no software to install and no watermark. The conversion runs on our server using ffmpeg, and the result is ready to save to your phone or computer in seconds. Your MP4 file is deleted automatically about 30 minutes after the conversion.
Why convert MP4 to AC3?
- Carries 5.1 surround sound
- Standard on DVDs and broadcast TV
- Accepted by home theatre receivers
- Opens in: DVD and Blu-ray players, AV receivers, VLC and video editors
What to expect from this conversion
- Only the first audio track is extracted. The picture is dropped, so the file is a small fraction of the video's size.
- AC3 is lossy, so choose High for the best sound or Small for the smallest file.
- Videos with no sound track cannot be converted to audio.
MP4 vs AC3
| Property | MP4 | AC3 |
|---|---|---|
| Full name | MPEG-4 Part 14 | Dolby Digital |
| Released | 2001, ISO/IEC (MPEG) | 1991, Dolby Laboratories |
| Family | Video | Audio |
| Opens in | Windows, macOS, Android, iOS, smart TVs, game consoles and every major browser | DVD and Blu-ray players, AV receivers, VLC and video editors |
| Best for | uploading to YouTube, Instagram, TikTok and WhatsApp; sharing a video that has to play everywhere | DVD and Blu-ray authoring; home theatre audio |
Steps to convert MP4 to AC3
- Drop your MP4 file onto the converter, or click to choose it.
- Check that AC3 is selected as the target format and adjust the options if you want.
- Press Convert, then save the new AC3 file to your device when it finishes.
Tips for the best result
- Choose MP3 for the widest compatibility.
- Pick FLAC or WAV if you want to edit the sound afterwards.
Frequently asked questions
How do I convert MP4 to AC3?
Drop your MP4 file on the converter, confirm that AC3 is the target format and press Convert. When it finishes, press Save to device or download the AC3 file. No account or software is needed.
Is the MP4 to AC3 converter free?
Yes. It is free, with no watermark, no sign-up and no limit on how many files you convert. The site is supported by ads.
What should I know before converting MP4 to AC3?
Only the first audio track is extracted. The picture is dropped, so the file is a small fraction of the video's size. AC3 is lossy, so choose High for the best sound or Small for the smallest file.
Can I extract the sound from a MP4 video as AC3?
Yes. The first audio track is extracted and saved as AC3. The video picture is not included.
Which programs open AC3 files?
AC3 files open in DVD and Blu-ray players, AV receivers, VLC and video editors.
How large a file can I convert?
Up to 500 MB per file. Files are deleted from the server about 30 minutes after conversion, and no one looks at them.