WEBM to MKV Converter

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MP4, WebM, AVI, MPEG, MKV, FLV, OGG, MOV, M4V, WMV, ASF, 3GP and other video files
Max file size: 200MB

All uploaded files are automatically deleted 1 hour after upload.
For permanent links you can use: https://ezgif.com/webm-to-mkv?url=https://example.com/source-video.mp4

Free Online WEBM to MKV Converter

WebM (VP9/Opus) is an open, royalty-free format optimized for web streaming. MKV (Matroska) is a flexible open container supporting multiple audio, subtitle, and chapter tracks. This tool lets you convert WEBM to MKV instantly in your browser — no software to install, no registration, and no watermarks. Uploaded files are automatically deleted from our servers after one hour.

The video and audio streams are copied directly into the new container without re-encoding, resulting in no quality loss.

Similar conversions: WebM to MP4, WebM to MOV, MKV to WebM.