Private Online Tools

Drop your file hereto convert it

Nothing is uploaded - the tools run right here

Convert WMV to MKV without uploading it

Turn a WMV file into MKV - here in this tab, with nothing uploaded.

How to convert WMV to MKV

  1. Drop your WMV file in.
  2. MKV is already selected - press Convert.
  3. Save the MKV file.

Why this one stays private

Converting a video elsewhere means uploading the whole thing, waiting, and trusting a stranger's server with footage that may not be yours to hand over. The conversion happens here instead.

Questions

Why convert WMV to MKV?

WMV is a Windows Media container that tends to be the odd one out on a Mac. MKV is the archivist's container: it holds anything, but few devices play it directly. Converting is how you move a file from the first situation to the second.

What will the MKV file contain?

H.264 video and AAC sound, though MKV holds almost anything, so most sources are repackaged as they are.

Is the picture re-encoded?

Yes. MKV cannot carry the Windows Media Video video a WMV file normally holds, so the picture is encoded again, at a quality setting high enough that the difference is hard to see.

Is the sound kept?

Yes. The audio track comes across with the picture - copied when MKV can hold it as it is, converted when it cannot.

Can a browser really open WMV files?

Not on its own - Chrome, Firefox and Safari cannot play WMV, which is why most in-browser converters turn WMV away or quietly upload it. This page brings its own decoder: FFmpeg, compiled to WebAssembly and fetched from this site (10 MB, once) the first time you convert. After that the WMV file is read entirely in this tab.

How long does it take?

Repackaging takes seconds. A full re-encode runs in this tab on one processor core, so a long HD video takes a while - but there is no upload or download to wait for.

The same tool, other formats