wallpaper same as display??

i dont know how to ask this question.

im searching the web for wallpaper sizes for phones so i can make my own protective skins.

80 percent of the time im getting my sizes based off sites with specs, but im going off the display size. i just want to confirm if display and wallpaper are the same thing or what i need to be searching for to get the correct size every time.

the latest one ive done is the htc rezound and got 1280 X 720 but the picture size look's to long for the phone, but the height is perfect.

help me please?

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You can use image editing softwares to change resolution of images.
Irfanview even does batch processing of images so you can download all wallpapers and then resize them.

acdsee is the best software for resizing wallpapers

Display size is probably correct, but wallpapers can be wider than the actual screen because most launchers allow you to scroll left and right.