Free WMV video converter

Convert WMV to MKV

Convert WMV videos to MKV for free, right in your browser. Upload a .wmv file, pick MKV from the output menu and download the converted video. Everything is re-encoded locally — no uploads, no accounts, no watermarks.

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What is WMV to MKV conversion?

Windows Media Video (WMV) and Matroska (MKV) are two popular video containers, but not every player or editor handles them all. This free converter reads your .wmv file, decodes its streams and re-encodes them into a valid .mkv file with widely supported codecs. The whole conversion runs in your browser, so your video stays private.

How it works

1Upload a .wmv video file.
2Choose MKV from the output format menu.
3Click Download — the video is re-encoded locally in your browser.
4Save the converted .mkv file. No signup needed.

Why this tool

100% private. The conversion runs entirely in your browser. Your video is never uploaded to a server.
Free, no signup. No accounts, no watermarks, no file size limits. Convert as many videos as you like.
7 output formats. Pick AVI, FLV, MKV, MOV, MP4, WebM or WMV from the dropdown when you download.

Frequently asked questions

Is converting WMV to MKV free?

Yes. This tool is completely free with no limits, watermarks or sign-up requirements.

Are my videos uploaded to a server?

No. The conversion happens entirely in your browser with ffmpeg.wasm, so your WMV file never leaves your device.

How do I convert WMV to MKV?

Upload a .wmv file, choose MKV from the output menu, click Download and wait for the local re-encode to finish.

What output formats can I choose?

AVI, FLV, MKV, MOV, MP4, WebM, WMV — the dropdown next to Download switches between them.

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