Convert WMV to MKV online in seconds — free, with no sign-up. MKV is lossy and ideal for archiving films with multiple tracks; converted to MP4 for compatibility. Your files are encrypted and deleted automatically after 24 hours.
WMV
Windows Media Video — A Microsoft format with limited support outside Windows.
MKV
Matroska Video — A flexible container that holds multiple audio, video and subtitle tracks.
How to convert WMV to MKV
- 1Upload your WMV file
Click “Choose a file” or drag and drop your WMV file onto the page — no sign-up or email needed.
- 2Convert to MKV
MKV is already selected as the output. Open Options to fine-tune quality if you like, then click Convert.
- 3Download your MKV file
Your MKV file is ready in seconds — click Download to save it. Files are automatically deleted after 24 hours.
WMV vs MKV
| WMV | MKV | |
|---|---|---|
| Full name | Windows Media Video | Matroska Video |
| Type | Video | Video |
| Compression | Lossy | Lossy |
| Best for | legacy Windows video; converted to MP4 for sharing | archiving films with multiple tracks; converted to MP4 for compatibility |
Frequently asked questions
Does converting WMV to MKV lose quality?
Both WMV and MKV use compression, so re-encoding discards a little more data. For a single conversion the change is virtually invisible; just avoid repeatedly re-converting the same file.
What's the difference between WMV and MKV?
Windows Media Video (WMV) is lossy and best for legacy Windows video; converted to MP4 for sharing. Matroska Video (MKV) is lossy and best for archiving films with multiple tracks; converted to MP4 for compatibility. Convert WMV to MKV when you need a video for archiving films with multiple tracks.
Is the WMV to MKV converter free?
Yes — converting WMV to MKV is completely free. There's no watermark, no sign-up and no email required, and you can convert as many files as you like.
Are my WMV files private and secure?
Yes. Your uploads are encrypted in transit, processed privately, and automatically deleted within 24 hours. We never share, sell or look at your files.
Can I convert WMV to MKV on iPhone, Android, Mac or Windows?
Yes. The converter runs entirely in your browser, so it works on any device — iPhone, iPad, Android, Mac, Windows or Linux — with nothing to download or install.
How long does it take to convert WMV to MKV?
Most files convert in a few seconds. Larger files take a little longer, and your upload speed is usually the limiting factor. There's no queue and no waiting for an email.
What else can I convert WMV files to?
Besides MKV, you can convert WMV to AAC, AVI, FLAC, FLV, GIF, JPG and more — see the full list of WMV conversions below.
Other conversions
Last updated July 2026