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WebM to MKV Converter
Convert WebM to MKV video — free and unlimited. No sign-up, no watermarks, no monthly limits. Full quality preserved. Files deleted after 1 hour. Powered by FFmpeg.
Upload your WebM file
Drag & drop or click to browse · Max 500 MB
How to convert WebM to MKV
Upload your video
Drag & drop your video file. Up to 500 MB supported.
Set output quality (optional)
Adjust bitrate, quality preset, or use the smart defaults.
Download your file
Hit Convert and download when ready. Conversion is server-side and fast.
Frequently Asked Questions
Is WebM to MKV conversion free?
Yes — 100% free with no monthly limits, no file count restrictions, and no watermarks. Convert as many WebM files to MKV as you need.
Do I need to create an account to convert WebM to MKV?
No account required. Just upload your file, click Convert, and download. That's it.
What is the maximum file size for WebM to MKV conversion?
Files up to 500 MB are supported. This covers the vast majority of Video files.
How long does WebM to MKV conversion take?
Most conversions complete in 5–30 seconds. Larger files may take slightly longer.
Are my WebM files kept private?
Yes. All uploaded files are permanently deleted from our servers within 1 hour. We never access or share your content.