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You're watching a video on a website and it's a WebM file — Google's open video format designed specifically for the web. WebM uses VP8/VP9 or AV1 video codecs with Vorbis/Opus audio, producing files that are often smaller than equivalent MP4s at the same visual quality.
Google developed WebM as a royalty-free alternative to H.264/MP4, which requires licensing fees (that browser vendors have been willing to pay). YouTube serves VP9-encoded WebM for most of its content. Chrome, Firefox, Edge, and Opera play WebM natively. Safari added VP9/WebM support in later versions. The format is particularly popular for web-embedded video, screen recordings shared online, and platforms that prioritise open standards.
Every modern browser plays WebM natively. VLC plays WebM files on any platform. For sharing video outside the web (sending to someone's phone, uploading to a platform that expects MP4), convert with <a href="https://fwip.app/tools/webm-to-mp4/">fwip</a>. The conversion is straightforward — WebM and MP4 are just different containers, and the video data often doesn't need re-encoding.
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