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Cifrivo
Audio

MP4 to MP3

Convert an MP4 video into an MP3 audio file with selectable bitrate and optional trimming.

FreeNo sign-upLocal processing

Your files are processed locally and never leave your device.

Drop your video here

Choose files from your device. URLs and platform downloads are not accepted. Up to 1 file, 250 MB each and 250 MB in total.

How it works

  1. Select the files accepted by MP4 to MP3.
  2. Choose the output and quality options.
  3. Start local processing and follow the real progress.
  4. Review the actual result and download it.

Practical example

Select a file in MP4 to MP3, choose 192 kbps when available and compare the real input and output sizes after processing.

Formula and explanation

MP4 is a container that may hold AAC or another audio codec. The audio is decoded and re-encoded as MP3 at your selected bitrate.

Supported path: MP4 → MP3. Compatibility also depends on the codec contained in each file.

Processing runs with FFmpeg WebAssembly inside this browser. Files are not uploaded to Cifrivo or a third-party service.

Frequently asked questions

Is MP4 to MP3 free?

Yes. It is free and requires no account.

Are my files uploaded?

No. All decoding, encoding and downloads happen locally in your browser.

Which formats are supported?

This tool supports MP4 → MP3. A valid extension, MIME type and file signature are checked first.

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Extract audio from MP4, WebM, MOV or M4V video and save it as MP3 locally.

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Compress audio

Reduce MP3, WAV or M4A file size with high, balanced or maximum compression.

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Change audio bitrate

Re-encode MP3 audio at 64, 96, 128, 192, 256 or 320 kbps and compare actual size.

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Extract audio from video

Upload an MP4, WebM, MOV or M4V and extract its audio as MP3 or WAV.