WebM to MKV Converter
Convert WebM video to MKV for organised media libraries, desktop players, home media systems, and flexible video workflows.
Drop your WebM files here
Up to 250MB per file.
Conversion Settings
Files are encrypted and auto-deleted after conversion
How to Convert
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Upload your WebM files
Drag and drop or select WebM files from your device. You can upload multiple files at once.
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Configure Output
Choose the video quality and keep the source dimensions or reduce the output size proportionally.
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Download MKV files
Once conversion finishes, download your files individually or as a compressed ZIP archive.
Why convert WebM to MKV?
WebM is an open web video format designed for modern browsers, websites, and online applications. Converting it to MKV creates a flexible Matroska video container used for media libraries, desktop playback, and home entertainment, ready for workflows that use the destination format.
MKV plays in VLC, Plex, Kodi, many smart TVs, desktop media players, and home entertainment applications.
Frequently Asked Questions
Why convert WebM to MKV?
WebM is designed for efficient video delivery in modern web browsers and web applications. MKV is a flexible container suited to organised media libraries, desktop players, and home media systems.
What does Crest Convert create from my WebM file?
Crest Convert creates a standard MKV video with a widely compatible video stream and includes the first audio track when one is present.
Can I adjust the MKV quality?
Yes. Choose the visual quality before converting your WebM file to balance detail and output size for your intended use.
Can I resize the converted MKV video?
Yes. Use the output size slider to retain the source dimensions or reduce the width and height proportionally while keeping the original shape.
Can I batch convert WebM to MKV?
Yes. Add several WebM videos, convert them together, and download each completed MKV file when it is ready.
How is my WebM video processed?
Your WebM file is transferred over an encrypted connection, converted securely to MKV, and automatically deleted shortly after processing. No account is required.