WMV to MKV Converter
Convert Windows Media Video (WMV) to Matroska Video (MKV) online for free. Runs 100% in your browser. Files never leave your device. No signup, no watermarks, no limits.
Drag & drop files here, or browse
Processed on your device. Nothing is uploaded
Automate this. An open tab can convert whole folders via the Local API - still zero uploads.
Local API →How to use WMV to MKV Converter
- 01Add files
Choose files or drop them here
- 02Settings
Settings · Runs on your device
- 03Download
Processed on your device. Nothing is uploaded
What is a WMV (Windows Media Video) file?
WMV is Microsoft's proprietary video format designed for Windows Media Player. Outside the Windows ecosystem it often requires conversion to MP4.
- Developed by
- Microsoft
- Initial release
- 1999
What is a MKV (Matroska Video) file?
MKV is a flexible open container that can hold unlimited video, audio and subtitle tracks. Popular for HD content, but not natively supported by many phones and TVs.
- Developed by
- Matroska.org
- Initial release
- 2002
Frequently asked questions
How do I convert WMV to MKV?
Click “Choose Files” or drag your WMV file onto the page, optionally adjust the settings, then hit Convert. Your MKV file downloads straight from your browser. Nothing is uploaded anywhere.
Is this WMV to MKV converter free?
Yes, completely free with no hidden limits, watermarks or signup. Because all processing happens on your own device, there are no server costs to pass on to you.
Are my files uploaded to a server?
No. The conversion engine runs entirely in your web browser using WebAssembly. Your files never leave your device. You can even disconnect from the internet after the page loads and keep converting.
Is there a file size limit?
We impose no fixed limit. The practical ceiling is your device's free memory, since processing happens locally. Most conversions work comfortably with files up to a few hundred megabytes, and image or document conversions handle much more.
Does it work on my phone?
Yes. The converter runs in any modern browser on Windows, macOS, Linux, Android and iOS. No app installation is required.