Convert MP4 to MP3 online, free
To convert MP4 to MP3, drop the video on the box above, keep MP3 selected and click “Convert”. The converter reads the audio track in your browser and saves it as an MP3 at the bitrate you choose (128–320 kbps). The video is never uploaded, and the original file stays as it was.
What happens to the picture?
Only the sound is kept. The video track is skipped, so the MP3 is a fraction of the MP4's size: about 1.4 MB per minute at 192 kbps, whatever the video's resolution.
Which bitrate to choose
- 128 kbps — speech, lectures, podcasts (about 1 MB per minute)
- 192 kbps — music in high quality, the default
- 320 kbps — maximum quality (2.4 MB per minute)
Long videos and many files
The file is read in pieces instead of being loaded whole, so long videos and files of several hundred megabytes work in current browsers. Drop several MP4s at once to get each MP3 separately or all of them in a ZIP.
Videos from iPhone and Android
Phone videos are MP4 or MOV with AAC sound. Chrome, Edge and Safari read them on computers and phones; Firefox depends on the codecs your system provides.
Other conversions
Frequently asked questions
How do I convert MP4 to MP3?
Drop the MP4 on this page, keep MP3 selected, choose a bitrate and click Convert. Download the MP3 when it is ready; the video is converted in your browser.
Is my MP4 uploaded anywhere?
No. The audio is read and encoded in your browser, so the video never leaves your device.
Does converting MP4 to MP3 reduce quality?
The sound in an MP4 is usually AAC, and converting it to MP3 encodes it again. At 192 kbps or more the difference is hard to hear. For no further loss, choose WAV or FLAC instead of MP3.
Can I convert several MP4 files at once?
Yes. Drop several videos: they are converted one after another, and you can download each MP3 or all of them as a ZIP.
Does it work on an iPhone?
Yes. Open this page in Safari, pick the video from your photos or files and download the MP3.