PureConverter

Convert MP4 to AC3

Convert MP4 files to AC3 locally, completely free and with maximum privacy.

Drag and drop your files here

or click to browse local files (large files supported, limited only by browser RAM)

Upload Files

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How to convert MP4 to AC3

  1. Drop your .mp4 files above, or click Upload Files. You can add many files at once.
  2. AC3 is already selected as the output. Open the settings (gear icon) to fine-tune the result.
  3. Click Convert All. FFmpeg runs inside your browser through WebAssembly; nothing is uploaded.
  4. Download your .ac3 files as soon as each one finishes.

What to know about MP4 to AC3 conversion

  • Only the audio track of the MP4 video is kept and encoded as AC3; the picture is discarded.
  • Videos without an audio track cannot be converted to audio.

MP4 vs AC3

MP4 (MPEG-4 Part 14): A widely compatible digital multimedia container format, most commonly used to store video and audio.

AC3 (Dolby Digital (AC-3)): A surround sound audio codec used on DVDs, Blu-ray discs, and digital television.

Conversion options

  • Bitrate from 96 to 320 kbps
  • Sample rate: 22.05, 44.1 or 48 kHz
  • Mono, stereo or 3D spatial audio
  • Playback speed (0.5× to 2×)

Frequently asked questions

Is it safe to convert MP4 to AC3 here?

Yes. Your files are processed entirely on your own device by WebAssembly code running in the browser. They are never uploaded, so nobody else can see them, and the converter keeps working even if your connection drops after the page loads.

Is there a file size limit?

There is no server-side limit. The only limit is the memory available to your browser, typically 1.5–4 GB on desktop computers.

Can I convert several MP4 files at once?

Yes. Add as many files as you like; they are converted in parallel according to your device's CPU cores, and you can apply the same settings to all of them.

Related conversions

Convert MP4 to other formats

Convert other formats to AC3

See every MP4 converter and AC3 converter, or browse the full converter directory.