Convert AVI to WebM — Free Online Converter

AVI is a pre-internet container with no streaming support, while WebM is Google's open-source format specifically designed for web delivery. WebM uses VP8 or VP9 video (royalty-free alternatives to H.264/H.265) with Vorbis or Opus audio in a Matroska-based container. WebM is supported natively in every major web browser — Chrome, Firefox, Edge, Opera, and Safari (since macOS Big Sur) — making it the standard for HTML5 video when patent-free delivery is needed. Converting AVI to WebM produces a web-ready, royalty-free video file.

WebM is the standard for web video when you need browser-native playback without licensing concerns. YouTube uses VP9/WebM as its primary delivery format. If you are building a website, web application, or video hosting platform that serves HTML5 video, WebM is the most efficient royalty-free option. VP9 achieves compression comparable to H.265 — roughly 30–50% better than H.264 — meaning smaller files with the same visual quality.