Want just the sound from a video? MP4 to MP3 needs one drop anywhere on this page: the audio track comes out as an MP3, encoded with LAME at 192 kbps by default. The video never uploads, and there is no file cap.
What people actually use this for
Lecture and meeting recordings that only need the audio, music practice takes, podcast material recorded on a phone, interview audio for transcription, voice notes trapped in video files. In every case the video is dead weight. This page throws it away instead of paying to ship it across the internet and back.
Why skipping the upload wins hardest here
Video files are big. A 20-minute 1080p recording is easily 1-2 GB: a 10+ minute upload on typical home internet, before conversion even starts. And most "free" tiers reject files that size outright. This page reads the audio track out of that same file in seconds. This is the single clearest case of upload converters selling you your own electricity.
FAQ
Is there a file size limit?
No fixed cap. Multi-GB files work best on a computer.
Does audio quality drop?
The track is decoded once and encoded to MP3 at your chosen bitrate. The default 192 kbps is transparent for speech and most music. For archival-grade audio, use MP4 to WAV instead.
My video has no sound in the result?
Some screen recordings store audio in a second track browsers skip. We're adding multi-track support. Tell us if you hit one.