As we have already said, the easiest way to change video formats is to change the extension in the URL of the file. For instance, let's say that the URL of your file is the following one: https://media.publit.io/file/myfirstvideo.mp4. Now simply change the mp4 extension of the URL with, let’s say, webm to get the following structure of the link: https://media.publit.io/file/myfirstvideo.webm.