I'm pretty computer illiterate so I just open the picture in Paint (the wonderfully simple program your computer comes with) and hit 'ctrl' A to select all of the picture and use the edit button and go to resize (streach/skew I think it's actually called) If you move the edges of the white part that is left to the edge of your now smaller picture, that is the size of the file then. I love it....paint saves the simple people like me ^_^