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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?

An MP4 to MP3 converter (also searched as video to MP3 converter, audio MP4 to MP3 converter, or .mp4 to .mp3) extracts the soundtrack from an MP4 video and encodes it as MP3. Use it to turn MP4 into MP3, convert MP4 into MP3 online, switch MP4 to MP3 format, or make video into MP3 for listening and sharing. This tool runs locally with FFmpeg WebAssembly, so your files stay on your device.

MP4 to MP3 converter features

Free online MP4 to MP3 converter — browser-based video to MP3 and MP4 to audio.

  • 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

How to turn MP4 into MP3, change MP4 to MP3 format, or convert MP4 to MP3 audio.

  1. Upload MP4 video

    Drop your MP4 (or MPEG-4) video file into the upload area.

  2. Choose MP3 bitrate

    Pick 128 kbps for balance or 192/320 kbps for higher audio quality.

  3. Convert and download

    Click Convert to MP3, then save the video to MP3 audio file.

Great for

Common MP4 to MP3 and video to audio conversion scenarios.

  • 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.

  • 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.

Frequently Asked Questions

Quick answers about this tool—open a question to read more.