video → mp3
Any video in, an MP3 out
Not every file you are handed is an MP4. This one takes whatever you have and finds the audio inside it, without caring what the wrapper happens to be called.
Processed on your own hardware · never transmitted, never stored
What happens when you drop a file in
The file stays put. Your browser opens it the same way an image viewer would. There is no transfer, which is why there is no upload bar to watch.
An encoder arrives once. The first job on this site pulls down a compiled build of FFmpeg, roughly 30 MB. It is kept afterwards, so every job after the first starts immediately.
Your own hardware does the job. The work happens in this tab, on your processor. A laptop from the last few years handles short clips in well under real time.
The result lands in Downloads. Assembled in memory and handed straight to your browser. Close the tab and every trace of it is gone.
One page instead of a dozen
Converter sites usually split this into a separate page per format — one for MP4, another for MOV, another for MKV. That split exists for search engines, not for any technical reason. The decoder underneath treats them all the same.
What actually differs is only the container: the box the video and audio sit in. Whether that box holds H.264 in an MP4 or VP9 in a WebM makes no difference once you are only after the sound.
This matters most for files you did not choose the format of — something downloaded from a chat app, exported by a screen recorder with its own ideas, or handed over by a colleague who never checked.
Speech and music want opposite things
For talking, 128 kbps is genuinely enough and keeps an hour under 60 megabytes. For music, 320 kbps, because that is where compression stops being audible in the parts of a mix that give it away. Mixed content sits comfortably at 192. If you are unsure, the middle setting has never annoyed anybody.
Common questions
Which formats does it read?
MP4, MOV, MKV, WebM, AVI, M4V and FLV, plus most variants of each.
How is this different from the MP4 page?
Only in what it expects you to bring. That one is aimed at MP4 specifically; this one takes anything. The output is the same.
The MP3 sounds quieter than the video did.
Levels are preserved exactly. Video players frequently apply their own loudness adjustment, and that is what you were hearing.
Is anything transferred?
No. Your browser opens the file locally and the work happens on your machine.