MP4 to MP3

How to convert MP4 to MP3

1. Drop a video onto the box above, or click it to pick one — MP4, MOV, M4V, WebM and MKV all work. The page then shows how long it runs and what kind of sound it carries.
2. Leave Save as on MP3 and choose a quality: 128 kbps for speech, 192 kbps for most music, 320 kbps when the source is very good. To keep the sound exactly as it was recorded, choose Original audio instead.
3. Press Convert to MP3 (the button reads Extract audio for the original track). A progress bar follows it, and Cancel stops it at any point.
4. The file downloads under the video’s own name, ending in .mp3 — or .m4a, .ogg and similar for original audio. If the browser held the download back, Download again repeats it.

What people use it for

Nearly every request is the same wish: the sound without the picture, in a smaller file that plays in the background or on something with no screen. (For the picture without the sound, there is Video to GIF.)

• Keeping a recorded lecture, sermon or webinar as audio for the commute.
• Rescuing a voice note or an interview that the phone saved as a video.
• Pulling a song or a whole set out of a concert clip you filmed yourself.
• Preparing the soundtrack of your own edit for a podcast feed or for transcription.

Good to know

MP3 is lossy: every conversion discards some detail, chosen to be what the ear is least likely to miss. Picking a higher bitrate than the original sound had makes the file bigger without making it better. When nothing should be lost, Original audio lifts the sound track out of the video without decoding it — usually AAC, saved as .m4a, or Opus from a WebM, saved as .ogg. It is also far quicker, since nothing is re-encoded. For MP3, surround sound is mixed down to stereo and unusual sample rates are converted to one the format allows.

Decoding is done by your browser’s own media engine (WebCodecs) and MP3 encoding by the LAME encoder, running inside this page. MP3 therefore needs a browser that can decode audio itself: current Chrome, Edge and Samsung Internet, Firefox 130 or later on a computer, or Safari 26 or later. Firefox for Android can’t yet, though Original audio still works there. Most MP4 to MP3 sites need the whole video on their servers first, which for a phone clip can mean hundreds of megabytes going up to bring a few back down; here the file is read straight from your own disk and goes nowhere else.

Questions people ask

Which bitrate should I choose?

192 kbps is the default and suits most music. 128 kbps is plenty for speech and comes to roughly 1 MB per minute. 320 kbps is the highest MP3 allows and is only worth it when the original recording is excellent — a phone video rarely is.

Is there a size or length limit?

None is set. The video is read from disk a piece at a time rather than loaded whole, so hour-long recordings are fine; only the finished audio sits in memory, at 1 to 2.5 MB per minute. Long files simply take longer.

Why did I get an .m4a file instead of an .mp3?

That is what Original audio produces. Most MP4 and MOV videos store their sound as AAC, and .m4a is AAC’s natural home when nothing is re-encoded. Phones, music apps and media players open it like an MP3; if something insists on MP3, switch Save as back and convert again.

Does it work with iPhone videos?

Yes — iPhone clips are MOV files with AAC sound, and both modes handle them. On the iPhone itself, MP3 needs iOS 26 or later; Original audio has no such requirement. If photos from the same phone are stuck in HEIC, HEIC to JPG converts those just as privately.