When saving files from the internet, you might have saved a file in the WebM format. Here's all you need to know to play or convert WebM files.
WebM is a royalty-free alternative for use in the HTML5 video and the HTML5 audio elements.
WebM is considered the sister to WEBP, designed for image compression by Google.
WebM is supported by all of the major browsers and multimedia players, including VLC Media Player. Applications that don't support WebM directly often have an available plugin.
If you want to convert a WebM file, there are always numerous third-party applications available, but many of them cost money and require installation. There are also numerous online conversion websites, including cloudconvert.com, and online-convert.
Select a file, choose a format, and click convert, then save. Easy to do!