Which video to iphone converter can convert mkv files?

Plus are there any free ones. Dvd sofware video to iphone is free but it can't convert mkv files…

IPhone video converter can help you convert mkv files to iPhone, iPhone, iPhone 3G, iPhone 3GS, iPhone 4 etc, including mac&windows version.
http://www.mac-videoconverter.com/iphone-video-converter-mac.html
Hope it helps!

E.M. Total Video Converter is a piece of extremely powerful and full-featured converter software that supports almost all video and audio formats. The software is designed to convert video for your mobile video player as 3gp, mp4, PSP, PS3, iPod, iPhone etc and also VCD or DVD player, XBOX360.

Most of iPhone video converter programs convert MKV files. Just google "MKV to iPhone", then it should pop up a bunch of programs. You sure can find one that meet your needs most.

Here is one.
http://www.dvd-to-iphone4.com/iphone-video-converter.html

You can try this iPhone Movie Converter. It offers a powerful and easy way to convert almost any video files such as MPG, MPEG, MPEG 2, VOB, DAT, MP4, M4V, TS, RM, RMVB, WMV, ASF, MKV, 3GP, 3G2, FLV, SWF, MPV, MOD, TOD, QT, MOV, DV, DIF, MJPG, MJPEG, HD video, AVI to iPhone/iPhone 3G/iPhone 3GS/ iPhone 4 MPEG-4, H.264/MPEG-4 AVC, MOV, M4V, also to iPod, iPod touch, iPod touch 2, iPod nano, iPod nano 4, iPod classic and Apple TV video formats with high speed and excellent image/sound quality.
For more information, go to:
http://www.bing.com/...&scope=web

I think you can use Tipard iPhone Video Converter, it can convert the popular video files including mkv format.
support input files: MPG, MPEG, MPEG 2, VOB, DAT, MP4, M4V, TS, RM, RMVB, WMV, ASF, MKV, AVI, 3GP, 3G2, FLV, SWF, MPV, MOD, TOD, QT, MOV, DV, DIF, MJPG, MJPEG.

so you can free download it and have try.
http://www.iphoneringtone.org/iphone-video-converter/
wish it can help you to solve your problem.