How to use MP4 to MP3
Drop an MP4, MOV, MKV, or WebM. The first conversion loads the FFmpeg engine — give it a minute on slow connections. Then Omnipus strips the video and encodes MP3. Download the audio. Use this only on files you own or have rights to convert.
Pull the soundtrack out of a lecture, interview, or clip. Omnipus runs FFmpeg as WebAssembly so the video is never uploaded. First use downloads the encoder (cached afterwards).
Also searched as mp4 to mp3, video to mp3, extract audio, convert mp4. All processing for this tool happens in your tab unless labeled otherwise.