Convert MP4 to AC3
Extract the audio from your MP4 video files and save it as AC3, directly in your browser.
How to convert video to audio in 3 steps
Choose a MP4 video file.
Click convert to AC3.
Download your AC3 audio.
Format descriptions
MP4 — MP4 is the most widespread and compatible video container. It supports H.264/HEVC and AAC codecs, making it ideal for streaming, the web and mobile devices.
AC3 — AC3 (Dolby Digital) is the standard audio codec for DVD, Blu-ray and home theater. It supports up to 5.1 channels of surround sound.
Technical comparison: MP4 vs AC3
Technical breakdown of the MP4 and AC3 specifications: compression, colour, transparency and animation support.
| Property | MP4 | AC3 |
|---|---|---|
| Specification | MP4 (MPEG-4 Part 14) | AC3 (Dolby Digital Audio Codec) |
| Media type | Video | Audio |
| Compression | Lossy · H.264 / HEVC + AAC | Lossy · AC-3 (up to 5.1) |
| Color space / bit depth | YUV 4:2:0, 8-10 bit | 16/20/24-bit 5.1 |
| Transparency | Not supported | Not applicable |
| Animation | Yes (animated) | No (static) |
| Best for | MP4 is the most widespread and compatible video container. It supports H.264/HEVC and AAC codecs, making it ideal for streaming, the web and mobile devices. | AC3 (Dolby Digital) is the standard audio codec for DVD, Blu-ray and home theater. It supports up to 5.1 channels of surround sound. |
What happens when converting MP4 to AC3?
The MP4 data is decoded inside your browser with WebAssembly and re-encoded to the AC3 specification, so no file is ever uploaded to a server. AC3 uses lossy compression: the file gets far lighter, but a small amount of fine detail is discarded in the process. MP4 supports animation while AC3 does not, so only the first frame is kept. Audio is re-encoded with the AC3 codec while keeping the original duration, so audio and video stay in sync.
Frequently Asked Questions
What is video to audio conversion?
Video to audio conversion extracts the sound track from a video file, for example from MP4 to AC3, keeping only the audio content.
Are my video files uploaded?
No. This tool processes video files directly in your browser. Your video files are never sent to a server.
Which video formats are supported?
This tool converts the audio of MP4 video files to AC3, all in your browser.
Is it really free and unlimited?
Yes, the tool is completely free and you can convert as many videos as you want, with no limits.
Does it work on mobile too?
Yes, it works on any modern device, including smartphones, tablets and desktop computers.
Which format will the result be in?
The converted file will always be in AC3 format, ready to download and use.
About the video to audio converter
Extract and convert the audio from your MP4 videos to AC3 for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.
See also:
- Video to Audio Converters
- Compress Videos OnlineCompress MP4, WebM, AVI, MKV, MOV, MPEG, TS and 3GP videos online for free. Reduce video file size while keeping good quality. Everything happens in your browser: videos are never uploaded to a server, and you need no downloads or sign-up to get started.
- Convert MP4 to MP3Extract and convert the audio from your MP4 videos to MP3 for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.
- Convert MP4 to WAVExtract and convert the audio from your MP4 videos to WAV for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.
- Convert MP4 to OGGExtract and convert the audio from your MP4 videos to OGG for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.