Automatic wallpaper Changer is a freeware utility that changes your desktop background at specified intervals. It allows you to select any number of images to change as your background and can run in the system tray. You can set the duration in minutes and hours or set random days. You can even save a list of favorite images for later use. It is simple to use and lets you change your wallpaper without your intervention. Moreover, it lets you manage the aspect ratio of your images.