Desktop wallpapers are images that can be used as your windows background. If you want to fill the entire monitor background, you should select a desktop wallpaper size with the same size as your displays resolution. When the photo opens in a new window, right click the image and save it to your computer.
Your current screen resolution is
(Because there are so many different options, you may not see your exact dimensions listed. Please select the closest match. You may need to try more than one to find the one that fits best.)