00video

MP4

MPEG-4 Part 14

MP4 is the container everything plays: usually H.264 or H.265 video with AAC audio. Because it is a container rather than a codec, two MP4 files can behave completely differently depending on what is inside them.

Extensions: .mp4 .m4v
MIME type: video/mp4

01 Convert MP4 to something else

MP4 to MP3 Extracts the audio track. The video never has to be decoded.
MP4 to WAV For editing and transcription, where you want no further loss.
MP4 to M4A The same AAC audio, just without the video.
MP4 to GIF Trim, scale and set the frame rate before it encodes.

03 Related formats

MOV
MKV
WebM

Opening a .mp4 file

If you landed here because something handed you a .mp4 file and nothing on your machine will open it, converting it to a format you already have a reader for is usually faster than installing new software. Every conversion above runs in this browser — the file is not uploaded, so it works on a locked-down work machine and on a file you are not allowed to send anywhere.