MP4 to MP3 — Extract Audio From Video Online
Extract the audio from an MP4 as MP3 right in your browser: choose the bitrate and download. The video is never uploaded.
Drag and drop your file here or click to select
About extracting audio from MP4
MP4 is a container holding a video track and an audio track side by side. When only the sound matters — a lecture, a podcast, music from a clip — the video can be dropped and the audio kept on its own. The file becomes dozens of times lighter: an hour-long recording goes from a gigabyte to a few dozen megabytes.
The audio inside an MP4 is almost always encoded as AAC, and MP3 is a different codec, so the track is re-compressed. The loss is minimal as long as you do not lower the bitrate: 128 kbps is plenty for speech and lectures, while music is better at 192 or 256.
Processing runs in your browser: the video is never uploaded, and on large files that is noticeable — no waiting for an upload or a queue. On the first run the browser downloads the engine once and takes it from cache afterwards.
Frequently asked questions
How do I extract the audio from an MP4?
Add the video to the tool, pick MP3 and a bitrate, then start the extraction. The finished audio file downloads straight away and nothing needs installing.
Which bitrate should I choose?
128 kbps is enough for speech, lectures and podcasts. For music, 192 or 256 kbps is better — on ordinary headphones the result is indistinguishable from the source track.
Will the audio quality drop?
Slightly: the sound in an MP4 is usually AAC, and converting to MP3 re-compresses it. At a bitrate no lower than the source, the difference is not audible.
Can I use a different video format?
Yes, the tool accepts MOV, MKV, WebM, AVI and other containers, not only MP4.
Is the video uploaded to a server?
No, everything happens in your browser on your own device — large files do not need to go anywhere.