Convert MP4 to MP3, Free & Private

How this MP4 to MP3 converter works

Converting MP4 to MP3 means keeping only the sound of a video and saving it as an audio file. VimCut drops the picture and encodes the soundtrack to MP3 at 192 kbps, which is a solid balance of quality and file size for music, podcasts and voice. Your original MP4 is not changed.

The conversion runs on WebAssembly (ffmpeg.wasm) in your browser, so the file stays on your device. The sound is encoded to MP3 rather than copied, so a video with no audio track has nothing to convert. Longer videos take longer because the whole soundtrack is processed. This page is set up for MP4 files, and the output is always an MP3. The finished file is a normal MP3 that you can download and keep, and a progress bar shows how far along the conversion is. Your original MP4 stays on your device.

Tips and related tools

For other video formats, use Extract Audio, which makes the same MP3. To keep the video and remove its sound instead, use Mute Video. The file is loaded into memory, so VimCut warns from about 500 MB, or lower on a phone with little memory, and blocks files above 2 GB.