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WebM converter

WebM is the format you reach for when video must live on the web on open terms: royalty-free codecs, native browser playback, no plugin politics. The conversion below encodes VP8 inside your browser with WebAssembly, so your clip stays on your machine while it happens.

What is WebM?

WebM is the web-native, royalty-free video format Google introduced in 2010, built on the VP8/VP9 video codecs and Vorbis or Opus audio. Every modern browser plays WebM directly, HTML5 video embraces it, and no patent licensing is attached to it anywhere in the chain. Outside browsers it is less at home: many desktop players, editing suites and devices still prefer MP4.

Convert WebM to another format

Convert another format to WebM

Common questions about WebM

What is a WebM file?
WebM is an open, royalty-free video container designed for the web, typically pairing VP8 or VP9 video with Vorbis or Opus audio. It is well supported in modern browsers and often yields smaller files than older formats, which is why many sites and HTML5 video players use it. The tradeoff is weaker support in some desktop media players and older devices.
Why won't my WebM open in some apps or on my TV?
WebM shines in browsers but is less universally supported in standalone media players, editing software, and smart TVs, which often expect MP4. If a WebM refuses to open or import, converting it to MP4 usually solves it.
How do I convert WebM to MP4?
hushvert converts WebM to MP4 in our server lane, since it uses native video processing without the in-browser size ceiling. The file uploads to a clearly labeled, encrypted lane, the input is deleted immediately after conversion, and the MP4 output is removed about an hour later. The result is a broadly compatible MP4 for editors, TVs, and older devices.
How do I extract MP3 audio from a WebM?
WebM to MP3 runs entirely in your browser on hushvert through WebAssembly, so the file never uploads. It takes the audio track (often Opus inside WebM) and re-encodes it to MP3, discarding the video. It is free, unlimited, no account required, and verifiable as no-upload in airplane mode or via the Network tab (see /privacy-proof).
Can I create a WebM from another format?
Yes. hushvert converts MP4 to WebM, and that conversion runs in your browser via WebAssembly, so your MP4 never leaves your device. It re-encodes to the open VP8/VP9 + WebM container, which is ideal for web embedding. Like all our client-side pairs, it is free, unlimited, and confirmable as no-upload in airplane mode.