WebM is an open-source video format developed by Google, primarily used for web video playback. It uses VP8 or VP9 codecs and is natively supported by Chrome, Firefox, and Edge. WebM files can get large when recorded at high quality, and compressing them reduces load times for websites and makes them easier to share while keeping browser compatibility.

Minimal quality loss with proper compression. Our tool optimizes the bitrate intelligently, preserving visual detail while significantly reducing file size. Most users report 50-80% size reduction with no noticeable difference during normal playback in a browser.

Chrome, Firefox, Edge, and Opera all support WebM natively. Safari added WebM support starting with macOS Big Sur and iOS 15. If you need universal compatibility across older browsers too, consider converting to MP4 instead.

For modern websites, WebM offers slightly better compression efficiency at the same visual quality compared to MP4 with H.264. However, MP4 has broader device and browser support. Many web developers serve both: WebM as the primary format with an MP4 fallback. If you only want one format, MP4 is the safer choice for universal playback.

You can upload WebM files up to 5 GB. This covers even long screen recordings and high-resolution web video content.

Yes. Your WebM files are transferred over encrypted HTTPS, processed on secure servers, and deleted automatically once compression is complete. No files are stored or shared.