Convert videos to any format
Drag & drop video file here
Supports MP4, MKV, AVI, MOV, WebM and more
Drag & drop your WEBM video
Automatic conversion with optimal settings
Save your converted MKV file
MKV supports the same codecs as WebM (VP9, Opus) plus many more. Convert to MKV when you need to add multiple audio tracks, subtitles, or chapters.
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 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 is optimized for web playback. MKV offers more flexibility for complex media with multiple tracks and metadata.
Common scenarios for this conversion
Convert WEBM to MKV when your device or app doesn't support the original format.
Upload MKV instead of WEBM for better support on YouTube, Instagram, and TikTok.
Convert to MKV for seamless import into professional editing software.
Play WEBM files on any phone by converting to MKV.
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.