WinX HD Video Converter - Version 4.1 WinX HD Video Converter is the most trusted HD (High Definition) video converter software which can convert among all popular HD video formats. Besides, it supports to convert between HD videos and SD videos. With intuitive interface, it brings you the most comfortable video converting experience. It provides you some additional features, for example, defining the video/audio parameters to optimize output video/audio quality as you wish. Main Functions:HD Video ConversionFully compatible with all HD video formats. It supports HD videos mutual conversion and SD to HD videos conversion. Moreover, HD to SD videos conversion can be also achieved by lowering the video resolution.Set Video Parameters