WEBM - WebM Video File is used for compressing video files that are created in WebM format. Everything that you will find is all of the highest quality. You will be able to get great video compression as well. It is used for sending online videos through different formats. Before you attempt to download anything to your computer, you will need to make sure that you are aware of the supported files, etc. It is also suitable for both commercial and non commercial program. You can find more information about these extensions online prior to downloading. You may already be familiar with the HTML 5 tag which this extension uses. There are many other formats that you can use along with this extension.