Convert MP4 to MP3
Convert your MP4 files to MP3 without installing anything, directly in your browser. Processing happens locally: no file ever reaches a server. Extracts the audio track from a video file.
Extracting the audio track from an MP4 video is the most common conversion: useful for podcasts, music videos, audiobooks, lectures, or interviews you only want to listen to. The output MP3 plays anywhere — phones, cars, smart speakers — and is roughly 10× smaller than the source video.
Drop files here, or click to browse
No files yet.
Why use convert-buddy to convert MP4 to MP3?
Free
Free, no signup, no premium tier.
100% local
Files stay in your browser — nothing uploaded.
No tracker
No tracker, no ads, no third-party scripts.
No limit
No file size limit, no daily quota.
Frequently asked questions
Does converting MP4 to MP3 reduce audio quality?
This conversion extracts only the audio track from your video file. The original video is not modified — you get a new audio-only file alongside it.
Are my MP4 files uploaded to a server?
No. The MP4 → MP3 conversion runs entirely in your browser, locally. Open the Network tab in your browser dev tools to verify it for yourself: no outgoing request is made during the conversion.
Is there a file size limit for MP4 files?
No limit imposed by convert-buddy. The only constraint is the memory available in your browser — on a modern desktop, multi-gigabyte MP4 files work fine.
What devices does MP4 to MP3 conversion work on?
Any modern browser: Chrome, Firefox, Edge, Safari, Brave. On Windows, macOS, Linux, iOS and Android. No installation, no signup.
How much does converting MP4 to MP3 cost?
Nothing. convert-buddy is fully free, no premium tier, no daily quota, no ads.
Related conversions
If you work with MP4 or MP3 files, these conversions may also be useful: