The two pixel sizes Apple accepts for the 6.5-inch slot
Answer: Apple lists two valid portrait dimensions for the 6.5-inch display class: 1284 x 2778 pixels and 1242 x 2688 pixels. Both are stored under the same App Store Connect slot, and either one passes upload validation, which is why competitor pages disagree about which number is correct.
Why two dimensions share one slot. The 6.5-inch class grew with the device lineup. When iPhone XS Max arrived, 1242 x 2688 was the only accepted portrait size. iPhone 12 Pro Max introduced a slightly larger 1284 x 2778 panel, and Apple expanded the same slot's allow-list rather than splitting it. The validator now accepts either dimension as a valid entry, provided every screenshot inside a given upload position matches.
Portrait and landscape orientations. Both dimensions share a 19.5:9 aspect ratio, so the landscape uploads are simply width and height swapped — 2778 x 1284 or 2688 x 1242. Pick one orientation for the slot and keep every file in it consistent; Apple does not auto-rotate, and mixing orientations inside the same shelf triggers a layout warning before review.



