Extract MP3 audio from MP4 video files online for free. Convert music videos, lectures, podcast recordings, or any MP4 to a portable MP3 audio file you can play on any phone, MP3 player, or media app. Processing runs in your browser — your video never uploads to a server.
Drop an MP4 video file into the upload zone or click to select one. The tool reads the file's audio track without re-uploading the video.
Powered by FFmpeg compiled to WebAssembly, the tool extracts the AAC audio stream from the MP4 container and re-encodes it as MP3.
Save the extracted MP3 file. The output keeps the original audio quality at standard 192 kbps bitrate.
Extract audio from a recorded meeting, lecture, or interview so you can listen on the go without carrying the full video file. MP3s are 5-10x smaller than the equivalent MP4 and play on every device.
Most online MP4 to MP3 converters require uploading your video, which is slow, uses your bandwidth, and risks your content being kept on the server. This converter runs FFmpeg locally in your browser, so a 100MB video extracts in seconds with no upload wait.
The output MP3 works on iPhones (in Files and most music apps), Android phones, Windows Media Player, VLC, iTunes, car stereos via USB, and every other MP3 player.