Convert WEBM to MKV
Free, instant, and secure online converter. Upload your .webm file and receive a crisp .mkv result in seconds.
Need the opposite conversion? Convert MKV to WEBM →
How to convert WEBM to MKV
Upload Your File
Click the upload zone or drag and drop your .webm file anywhere on the area.
Start Converting
Hit Convert and our server will process your file instantly with high fidelity preservation.
Download Result
Your .mkv file is ready in seconds! Click download. Files auto-delete in 6 hours.
WEBM vs MKV: Comparison
| Attribute | WEBM (.WEBM) | MKV (.MKV) |
|---|---|---|
| Category | video | video |
| MIME Type | video/webm | video/x-matroska |
| Description | WEBM is an open, royalty-free video format optimized for fast web playback. | MKV (Matroska) is an open-source container that can hold virtually unlimited video, audio, and subtitle tracks... |
About These Formats
About WEBM files
WEBM is an open, royalty-free video format optimized for fast web playback.
About MKV files
MKV (Matroska) is an open-source container that can hold virtually unlimited video, audio, and subtitle tracks.
Frequently Asked Questions
How do I convert WEBM to MKV?
Upload your .webm file using the box above, or drag and drop it in. We'll automatically convert it to .mkv format — just click download when it's ready.
Is it free to convert WEBM to MKV?
Yes. Converting WEBM to MKV is completely free, with no watermarks, no signup, and no limit on how many files you convert.
Is it safe to convert files here?
Yes. Files are processed securely and automatically deleted from our servers a few hours after conversion. We never share or view the contents of your files.
What is a webm file?
WEBM is an open, royalty-free video format optimized for fast web playback.
What is a mkv file?
MKV (Matroska) is an open-source container that can hold virtually unlimited video, audio, and subtitle tracks.