Convert MP4 to MP3 without uploading it
Import your MP4 and get the sound as an MP3 that plays on everything. The conversion runs on your device, so nothing is sent anywhere.
How to convert an MP4 to MP3
- 1
Import your MP4
Drop the video file. It stays on your device, nothing is uploaded.
- 2
Choose MP3 and a bitrate
192 kbps is transparent for speech and published music. Pick 320 kbps for high quality music.
- 3
Save the MP3
Start the conversion and download the file, ready for your player, your car or your podcast edit.
The audio is out. Now make it listenable.
Montaj cuts the silences, cleans up a noisy recording with an on-device model and writes word-by-word subtitles — all on your device, without uploading anything.
Frequently asked questions
How do I convert an MP4 to MP3 for free?
Import the MP4 on this page, choose MP3, then start the conversion. The picture is discarded and only the audio track is kept, saved as a standalone MP3. No account and no watermark.
Is the MP4 uploaded to a server?
No. Everything happens inside your browser, on your device. That is what makes the tool usable on a recording you would not want to hand to an online converter.
What bitrate should I choose?
192 kbps is the sensible default: inaudible from the source on speech and on published music, for a file about a tenth of the video's size. Go to 320 kbps for music you care about, or down to 128 kbps when the file has to be small.
Does converting MP4 to MP3 lose quality?
MP3 re-encodes, so strictly speaking yes, but at 192 kbps and above the loss is inaudible in normal listening. If you need zero re-encoding loss, export to WAV instead.