First run downloads FFmpeg (~25 MB) once in this browser. Audio extraction runs locally — no server upload.
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MP4 to MP3 converter — video to MP3 online
Convert MP4 to MP3 online free. Free MP4 to MP3 converter — turn MP4 into MP3, switch video to MP3 audio with selectable bitrate, no server upload.
What is an MP4 to MP3 converter?
MP4 to MP3 converter features
Convert MP4 to MP3 online free
Upload an MP4 and convert MP4 into MP3 online free with no software install.
Video to MP3 converter
Turn video to MP3, convert videos to MP3, or use a vid to MP3 workflow when you only need audio.
Audio file converter MP4 to MP3
Extract MP4 to audio as a portable MP3 for phones, players, and editors.
MP4 format to MP3
Change MP4 format to MP3 or convert .mp4 to .mp3 for everyday playback.
Selectable MP3 bitrate
Choose 96 to 320 kbps depending on quality and file size needs.
No server upload
All conversion runs locally with FFmpeg WebAssembly for privacy.
How to convert MP4 to MP3
Upload MP4 video
Drop your MP4 (or MPEG-4) video file into the upload area.
Choose MP3 bitrate
Pick 128 kbps for balance or 192/320 kbps for higher audio quality.
Convert and download
Click Convert to MP3, then save the video to MP3 audio file.
Great for
Music and soundtrack extraction
Save background music or song audio from MP4 videos as MP3.
Podcast and voice clips
Convert video to MP3 for spoken content and audio-only publishing. If the episode needs artwork, attach it to the downloaded MP3 with MP3 Cover Adder.
Smaller audio sharing
Share an MP4 to audio file instead of sending the full video.
Offline listening
Turn a video into an audio file for lectures, interviews, and commute playlists.