MP4 vs WebM: Which Video Format Should You Use?

Choose a format based on where the video will play, then test it on that device.

Compare the complete file

MP4 and WebM are containers, not codecs. Browser playback depends on the tracks inside as well as the container.

Sharing and editing

Try the original file in your destination first. Convert a WebM when your recipient or editing application needs MP4. Keep the source to avoid repeated lossy exports.

Check the converted result

Use a short test clip. Review motion, sound and synchronization after export before converting a long recording.

Reference: MDN media container guide.