From the web to every device
WebM is great in browsers, but iPhones, PowerPoint, many video editors and some social platforms work better with MP4. WebM uses VP8, VP9 or AV1 video and Opus audio, which MP4 players often do not support, so the converter re-encodes the video to H.264 and the audio to AAC using the hardware encoder of your device.
Screen recordings made in the browser are usually WebM, so this is the quickest way to make them ready for email, Teams or a support ticket.
Speed
Re-encoding takes a moment: on a modern laptop a minute of 1080p video usually takes a few seconds to half a minute. The progress bar shows how far it is.
About WebM
WebM is an open video format designed for the web, with VP8, VP9 or AV1 video and Opus audio. Browsers play it natively.
About MP4
MP4 is the most widely supported video format. With H.264 video and AAC audio it plays on practically every device and platform.