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MP4 to MP3 Converter

Pull the audio track out of a video and save it as MP3. Bitrate, sample rate and loudness are yours to set.

  • Unlimited
  • No signup
  • Private
  • Works offline

Extract audio from a video

44.1 kHz is CD quality and the safe pick. A lower rate cuts the treble, and only makes WAV and FLAC files smaller.

Bitrate
Audio options
Commandffmpeg -i input.mp4 -vn -af loudnorm=I=-14:TP=-1.5:LRA=11 -c:a libmp3lame -b:a 256k -map_metadata 0 audio.mp3
Choose a video to start

How it works

  1. 01

    Pick a video

    MP4, MOV, MKV or WebM. The tool reads the audio track out of the video file.

  2. 02

    Choose bitrate

    256 kbps suits music. 128 kbps is plenty for talks and podcasts.

  3. 03

    Download the MP3

    With Copy title and artist tags on, the MP3 keeps the tags the source has.

Choosing a bitrate

MP3 throws detail away, so the bitrate decides how big the file is and how close it sounds to the source. For speech, such as lectures, interviews and podcasts, 128 kbps is enough and keeps an hour under 60 MB. For music, 256 kbps is hard to tell from the source, and 320 kbps is the most MP3 can carry.

If the video carries a 128 kbps AAC track, a 320 kbps MP3 adds no detail. It only makes the file bigger. So pick a bitrate at or just above the source. WAV keeps the decoded audio with no further loss, at more than ten times the size of a 128 kbps file.

Input
MP4, MOV, MKV, WebM, AVI, plus audio-only sources.
Output
MP3, AAC (M4A), WAV, FLAC, OGG.
Size
No fixed cap. The whole file is loaded into memory first, so it has to fit.
Loudness
An optional switch evens the loudness out to -14 LUFS.

Frequently asked questions

Does converting to MP3 lose quality compared to the video audio?
A little. The video's audio is already compressed, and MP3 compresses it again, so some detail is lost twice. At 256 kbps or above you are unlikely to hear it. Choose WAV or FLAC if you need the decoded track with no further loss for editing.
Is there a size limit on the video?
There is no fixed limit, because the file never uploads. The tool loads the whole file into memory before it starts, so the limit is how much memory your browser has spare.
Do you upload my video to extract the audio?
No. Your browser reads and decodes the file on your device, and the video never leaves it.
Can I convert to something other than MP3?
Yes. AAC (M4A), WAV, FLAC and OGG are all available from the output format menu.
Will the file keep its title and artist tags?
Yes, if the source has them and Copy title and artist tags is on. It is on by default.
How long does a 40-minute video take?
It depends on your device, the source and the settings. The progress bar is measured against the video's own timeline, so it shows how far through the audio the tool is.

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