What is WEBM and why would you want to convert your videos to WEBM? There are several good reasons. First, WEBM is a completely royalty-free video format, which means that many people can work with it and introduce improvements. Second, WEBM is supported by many browsers such as Opera, Google Chrome, and Mozilla Firefox for seamless video playback.
It is widely used in many HTML5 video players, for example by Skype, Nintendo, Logitech, and more. If you want to use your video online, for streaming or better compatibility, consider converting it to WEBM.