This free Matroska MKV converter lets you convert video files from a variety of source formats to the MKV format. Just upload a file or provide a URL to a video and hit the "Convert file" button. Optionally you can select video enhancements to change video quality settings.
Drop Files here
The MKV converter lets you convert from many different source formats like AVI to MKV, MP4 to MKV, MPEG to MKV, 3GP to MKV, WMV to MKV and many more. For futher information about the Matroska MKV container format, you can take a look at the Matroska homepage.