Google Images used to have a very useful one choice “search by size” in the advanced search to help you find logos, wallpapers and other images onnetwork with their exact size (or resolution).
For example, you could narrow your search for landscape photos to archives εικόνας με μέγεθος τουλάχιστον 10 Megapixels. 
Alternatively, if you use Google Image Search to find wallpapers for surface task, you could specify the image resolution as 1920×1080 pixels and Google would only return large images with those exact dimensions.
The "exact size" search option is no longer available in Google Image Search, but you can still specify the size of the images in your searches using a search algorithm command.
See how.
Open the address images.google.com and enter your search terms as you always did. Then add imageize: LENGTH to your query and press Enter. Google will read the additional command in the query, remove it, but the results will only display images that match the specified size.
This resize search also works in the mobile version of Google. So you can use this simple trick to find the perfect wallpaper size for your phone.
