Screenshot sizes for publishing app on App Store
When publishing an app in the Apple App Store, you are required to provide app screenshots. The screenshots are shown in your App Store listing and play a huge role in driving more downloads.App Store screenshots (iOS iPhone / iPad). The iOS App Store enables users to upload up to 10 screenshots.The tables below outlines which sizes are required and the corresponding pixels for portrait and landscape orientation.

Device Size | Device | Portrait Screenshot Size | Landscape Screenshot Size |
6.5 inch | iPhone 11 Pro Max, iPhone 11, iPhone XS Max, iPhone XR | 1242 x 2688 pixels | 2688 x 1242 pixels |
5.5 inch | iPhone 6s Plus, iPhone 7 Plus, iPhone 8 Plus | 1242 x 2208 pixels | 2208 x 1242 pixels |
12.9 inch | 3rd generation iPad Pro | 2048 x 2732 pixels | 2732 x 2048 pixels |
12.9 inch | 2nd generation iPad Pro | 2048 x 2732 pixels | 2732 x 2048 pixels |