Free tool
Free MP4 to MP3 converter, no upload
This MP4 to MP3 converter takes the sound out of an MP4 and saves it as an MP3, without sending the file anywhere.
Your MP4
Drag a file here, paste it, or choose one.
.mp4, .mov, .webm, .mkv, .m4v, .avi. Up to 500 MB.
Up to 3 hours of audio.
Your file never leaves your browser. The conversion runs on this machine.
More options
Trim
Leave both empty to keep the whole file. Seconds like 1:05.5 work too.
Result
Worked example
Measured on our own 137 second explainer film at 1920 by 1080, saved as MP3 at 192 kbps.
Source MP4
89.1 MB
MP3, 2:17
3.1 MB
The MP3 is under 4% of the MP4, because the picture was almost all of the file. At 192 kbps the sound takes about 1.4 MB a minute, whatever the resolution of the video it came from.
1. Add your file. 2. Pick the output. 3. Convert in the tab. 4. Listen and download.
What Interlace does
Pulling the sound out of a recording? Start from a clear one.
- Paste the script or upload the document
- Natural AI voices read it, in 28 languages
- Scenes are drawn and timed to the voice
Real Interlace output, unedited. Shown silent and sped up.
Your file
q3-all-hands.mp4
Keeping the audio only
Questions
Asked and answered
No. The file is read by the page and converted by ffmpeg compiled to WebAssembly, on your own machine. There is no upload step, and closing the tab discards everything.
A little, in theory. The sound in an MP4 is already compressed, almost always as AAC, and MP3 compresses it a second time. At 192 kbps that second pass is very hard to hear. Picking 320 kbps does not bring back what the first compression removed; it only makes a bigger file.
128 kbps for a talk, a lecture or a meeting. 192 kbps for music or anything you will listen to closely. 64 kbps is enough for speech you only need to search or transcribe. At 192 kbps an hour of audio comes to about 82 MB.
Because the picture is gone. The video stream is almost all of an MP4's size. In the worked example on this page, a 137 second, 1080p film drops from 89.1 MB to 3.1 MB.
Yes. Both save meetings as MP4 with AAC sound. Zoom can also save the audio on its own as an M4A, which the M4A to MP3 converter handles. Recordings up to 500 MB and three hours work here.
Turn this into a video
Create an account and start from a document, script, or prompt.