Convert any video to WebM format for optimal web performance. Uses VP9 video codec with Opus audio for excellent quality at small file sizes. The open, royalty-free format built for the web.
Drop your video file here (MP4, AVI, MOV, MKV, WMV...)
Maximum file size: 500MB
Drag and drop or browse to upload any video. Supports MP4, AVI, MOV, MKV, WMV, FLV, and more formats.
Our FFmpeg engine encodes your video with VP9 video codec and Opus audio for the best quality-to-size ratio on the web.
Preview the result in your browser, then download your web-optimized WebM file. No watermarks added.
WebM is an open, royalty-free video container format developed by Google specifically for web use. It uses the VP9 video codec (successor to VP8) paired with the Opus audio codec to deliver exceptional quality at significantly smaller file sizes than H.264/MP4. As an open standard, WebM is free from licensing fees, making it the preferred choice for HTML5 video, website backgrounds, web apps, and progressive web experiences.
Our free video to WebM converter handles virtually every video format. Upload MP4, AVI, MOV, MKV, WMV, FLV, M4V, MPEG, MPG, 3GP, TS, and dozens more. The converter automatically detects the source codec and applies optimal VP9 encoding settings for the best WebM output.
Optimize MP4 videos for your website. WebM delivers smaller files with comparable quality, improving page load times and Core Web Vitals scores.
Hero section backgrounds need to be lightweight. Convert to WebM for the smallest possible file size without visible quality loss on autoplaying backgrounds.
Building a web application with video? WebM is the native format for HTML5 video elements, offering the best browser compatibility and streaming performance.
Legacy formats like MOV and AVI are not web-friendly. Convert to WebM for modern, efficient web delivery with universal browser support.
Yes, completely free with no registration, no watermarks, and no hidden fees. Convert as many videos as you need.
For web use, WebM offers smaller file sizes than MP4 at comparable quality thanks to VP9 compression. It's also royalty-free. However, MP4 has broader device support, so many developers serve both formats with WebM as the primary source.
Our converter uses VP9 for video and Opus for audio — the latest and most efficient codecs supported by the WebM container. VP9 delivers up to 50% better compression than H.264, while Opus is widely regarded as the best audio codec available.
Yes, all modern browsers support WebM including Chrome, Firefox, Edge, Opera, and Safari (since Big Sur). WebM has over 97% global browser support, making it safe for production web use.
Absolutely. All files are processed on secure servers with encrypted connections and automatically deleted within 24 hours. We never access or share your video content.
Files are processed securely and automatically deleted after 24 hours
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