How to Extract Audio from a Video

In your browser

1. Open MP4 to MP3, or Video to MP3 for MOV, WebM, MKV and other formats.
2. Pick a quality. 192 kbps suits speech and most music; 320 kbps is the highest MP3 quality.
3. Drop in the video and download the MP3.

The conversion runs on your computer with FFmpeg, so the video is never uploaded. The first use downloads the converter, about 30 MB.

Choosing a format

• MP3 plays on everything.
• M4A (AAC) sounds better than MP3 at the same size and is what iPhones use.
• WAV or FLAC for editing, as they are lossless. They do not add quality the video did not have.

The Audio Converter saves to any of these.

With VLC

In VLC, choose Media → Convert / Save, add the video, click Convert / Save, pick the Audio - MP3 profile, choose where to save it, and click Start.

With FFmpeg

If you have FFmpeg installed, this saves the audio as a 192 kbps MP3:

ffmpeg -i video.mp4 -vn -c:a libmp3lame -b:a 192k audio.mp3

Most MP4 files already contain AAC audio, which can be copied out without re-encoding, instantly and with no quality loss:

ffmpeg -i video.mp4 -vn -c:a copy audio.m4a