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Why convert WEBM to MKV?
Fast
Your file is converted in under 30 seconds in our cloud.
Secure
Files are automatically deleted after 1 hour.
Quality preserved
Maximum quality preserved during conversion.
About the WEBM format
WebM — Web Media
WebM is an open, royalty-free video format developed by Google for web video. It is the standard format for HTML5 video, using VP8/VP9 or AV1 video with Vorbis/OPUS audio, providing excellent streaming performance.
Common uses
- HTML5 web video
- Browser-based video streaming
- YouTube alternative encoding
- WebRTC video calls
About the MKV format
MKV — Matroska Video
MKV is a free and open multimedia container that can hold virtually any number of video, audio, and subtitle tracks. It is the go-to format for high-quality movie rips, supporting 4K, HDR, and multiple language audio tracks.
Common uses
- High-quality movie storage
- 4K and HDR video content
- Anime with multiple subtitle tracks
- Multi-language media collections
Related conversions
Other conversions available for WEBM and MKV files
Frequently asked questions
How do I convert WEBM to MKV?
Upload your WEBM file above, choose MKV as the output format, then click Convert. Your MKV file is ready to download in seconds — nothing to install, and it works in your browser.
Is the conversion free?
Yes, basic conversion is completely free. For large volumes, check out our paid plans.
What is the maximum file size?
Free accounts can convert files up to 25 MB. Pro accounts up to 100 MB.
How long are my files kept?
Files are automatically deleted after 1 hour on the free plan, 24 hours on Pro.
What formats are supported?
We support over 200 source and target formats. See our complete formats page.
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