Convert MP4 to MP3 Online
Extract the audio track from MP4 or WebM video and save it as MP3 or WAV — entirely in your browser, no upload.
Processed entirely in your browser — nothing you enter here is ever uploaded.
Result
About this tool
This page opens the audio extractor with MP3 preselected — drop an MP4 video and get its soundtrack as a compact MP3 file. MP4 is the most common video container on phones, cameras and download sites, and its audio track (usually AAC) decodes in every modern browser, so extraction takes just a couple of clicks.
MP3 is the right choice when the audio itself is the goal: saving music from a clip you recorded, turning a lecture or webinar into a listenable file for the road, or sending just the voice memo part of a video through a messenger. An MP3 is typically 8–10 times smaller than WAV, plays on literally every device, and the quality difference is inaudible for speech and most music.
The conversion runs entirely on your device: the Web Audio API decodes the track, then the browser's own media encoder writes the MP3 in real time — a 3-minute video takes about 3 minutes, so keep the tab open. If your browser cannot encode MP3 (some cannot), the tool automatically falls back to lossless WAV so you never leave empty-handed.
Example. The audio track of an MP4 or WebM file is written out as WAV, or as MP3 when the browser's MediaRecorder supports audio/mpeg.
Limit. MP3 export is skipped, with a notice, when audio/mpeg is not a supported recorder type.