Generally we need the the Screenshot of app for publishing the iOS app to App store , for this we need to follow some steps:
1: we need the 5 images of each device
a: for iPhone X
b: for iPhone 5.5 display.
c: for iPad 12.9
2: Now you have to take screenshot of each device
a: iPhone X -> take a screenshot whose resolution would be (1125 X 2436)
b: for iPhone 5.5 – > you can take screenshot from iPhone 6,6s,7,7s,8 but resolution must be in (1242 X 2208)
c: for iPad 12.9 -> you can take screen shot from iPad but resolution must be in (2048 X 2732)
for resizing this image you can take help from this link:
URL: http://resizeimage.net/
you can set resolution like this
Ex: for 1242 X 2208
