Convert
Convert MP4 to MP3
Free, in your browser, with no watermark and no signup. This produces an audio file, discarding any video track.
Why you have a MP4 file
Sometimes only the sound matters: pulling the audio from an interview to transcribe it, lifting a voiceover out of a finished edit, or turning a video into something you can listen to without watching.
What the conversion actually does
The video track is discarded entirely and the audio track is encoded to MP3. Because the picture is usually the overwhelming majority of a video file, the result is dramatically smaller.
Worth knowing first
This throws the video away permanently, so keep the original. And the audio is only as good as it was in the video; extracting cannot recover what a bad microphone never captured.
How to convert MP4 to MP3
- 01
Add your MP4 file
Drop it in, or pick it from your device. Free uploads go up to 1 GB per file.
- 02
Choose MP3
Pick the output format from the list. Queue several files of the same type to batch them.
- 03
Download
Watch progress live, then download the result. No watermark, on any plan.
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Frequently asked
How do I convert MP4 to MP3 for free?
Open the GrumpTools File Converter, add your MP4 file, choose MP3 as the output and download the result. It runs in the browser, output is never watermarked, and free uploads go up to 1 GB per file.
Does converting MP4 to MP3 reduce quality?
This throws the video away permanently, so keep the original. And the audio is only as good as it was in the video; extracting cannot recover what a bad microphone never captured.
Can I convert several MP4 files at once?
Yes. Queue multiple files of the same type and convert them in one batch, then download them individually or all at once.