Convert videos to any format
Drag & drop video file here
Supports MP4, MKV, AVI, MOV, WebM and more
Drag & drop your MKV video
Automatic conversion with optimal settings
Save your converted WEBM file
Convert MKV to WebM for web-optimized playback. WebM with VP9 delivers excellent quality at small file sizes for HTML5 video embedding.
MKV is a flexible, open-standard container format that can hold an unlimited number of video, audio, subtitle, and metadata tracks. It's the preferred format for high-quality video archival and media collections.
WebM
WebM is an open, royalty-free video format developed by Google, optimized for web use. It uses VP9 or AV1 for video and Opus for audio, offering efficient compression ideal for HTML5 video and web applications.
MKV is flexible and feature-rich. WebM is streamlined for web delivery. Both support VP9, but WebM is better recognized by browsers.
Common scenarios for this conversion
Convert MKV to WEBM when your device or app doesn't support the original format.
Upload WEBM instead of MKV for better support on YouTube, Instagram, and TikTok.
Convert to WEBM for seamless import into professional editing software.
Play MKV files on any phone by converting to WEBM.
Your files never leave your device. All conversion happens in your browser — no server uploads.
Hardware-accelerated conversion powered by WebCodecs and WebAssembly.
Convert between any video format combination.