4Videosoft MKV Video Converter is able to help you convert MKV video to other video formats like MP4, MOV, AVI, FLV, etc. You can optimize the output videos with the nice editing functions. You can also reset the video length and size, add personalized watermark and modify the output video effect. It allows you to enjoy the output video on your portable devices like Samsung Note 4, Samsung Galaxy S5, iPhone 6s/6s Plus, iPad Air, HTC one and more.