Free tool

MP4 to MP3 converter the sound from a video, as an MP3.

Drop MP4 files and download the sound as MP3. Choose the bitrate, keep stereo or go mono, several files at once.

MP4 to MP3 converter at a glance

content.win pulls the audio out, even from a large video.

Works with
MP4, MOV, WebM and MKV.
Comes back as
MP3 or WAV, the full length.
Runs
In your browser.
Limits
No daily limit and no cap on how many files.
Price
Free. No account, no watermark.

How to convert MP4 to MP3

  1. Drop the MP4 files in. Recorded lectures, podcast videos, music videos, voice notes saved as video.
  2. Pick a bitrate. 128 kbps for speech, 192 for music, 320 when every detail matters. Mono halves the size of a speech recording.
  3. Download the MP3s. Named after the videos, ready for any player, phone or editor.

What people pull audio out for

Podcasts and interviews
A video call or a recorded stream becomes the audio episode. 128 kbps mono keeps a one-hour talk around 55 MB.
Music
A performance or a track only available as a video, saved for a playlist. 320 kbps keeps everything the video carried.
Lectures and notes
Listen on the go without the video. Mono at 128 kbps is small and clear.
Editing
Bring the sound into Audacity, GarageBand or a DAW without the video.

About quality

  • The audio inside an MP4 is usually AAC at 128 to 256 kbps. Converting to MP3 re-encodes it once; at 192 kbps or above the difference is inaudible for almost all listeners. It cannot add quality the video did not have.
  • For an exact copy without re-encoding, choose WAV on the main extract audio tool.

Questions people ask

Does MP4 to MP3 lose quality?

One re-encode from the AAC inside the MP4 to MP3. At 192 kbps or above it is inaudible for nearly everyone. Choose WAV on the main tool for a lossless copy.

Which bitrate should I pick?

128 kbps for speech, 192 kbps for music, 320 kbps for archiving music. Mono halves the size for anything spoken.

How big will the MP3 be?

About 1 MB per minute at 128 kbps, 1.4 MB at 192, 2.3 MB at 320. Mono halves those.

Can I convert several videos at once?

Yes. Drop them all; one button downloads every MP3.

Does it work with MOV, WebM or MKV?

Yes, on the main extract audio tool, which takes any video the browser can play.