“The dimensions of one or more screenshots are wrong” — how to fix it
App Store Connect shows this error when an uploaded image doesn't match one of Apple's exact accepted resolutions for that display size. The fix is to resize your screenshots to a valid size — most commonly the 6.9″ iPhone size 1320×2868 (or 1290×2796) — as a flattened .png or .jpg with no transparency, then re-upload. Below are the exact sizes Apple expects and the fastest way to get there.
Why this error happens
- The image resolution doesn't match any accepted size for that display class (even by 1 px).
- You uploaded an image to the wrong size slot — e.g. a 6.5″ (1284×2778) image into the 6.9″ (1320×2868) slot.
- The PNG has an alpha channel / transparency. App Store screenshots must be flattened, RGB, no alpha.
- The file is HEIC or another unsupported format — only .jpg, .jpeg, and .png are accepted.
- A simulator or device captured at a non-standard scale, producing an off-spec resolution.
How to fix it in 4 steps
- 1Identify which display size slot the rejected image belongs to (usually 6.9″ iPhone or 13″ iPad).
- 2Resize or re-export the image to one of the exact accepted resolutions for that slot (see the table below).
- 3Flatten it — export as .png or .jpg in RGB with no transparency/alpha channel.
- 4Re-upload to the correct size slot in App Store Connect.
Or skip the manual work entirely: mockscreens exports every required App Store size at the correct pixel dimensions — flattened and store-ready — in one click.
The correct iPhone screenshot sizes
Match one of these resolutions exactly. See the full App Store screenshot sizes guide for iPad and details.
| Display | Resolution (portrait, px) | Devices | Requirement |
|---|---|---|---|
| 6.9" | 1320×2868 · 1290×2796 · 1260×2736 | iPhone Air, 17 Pro Max, 16 Pro Max, 16 Plus, 15 Pro Max, 15 Plus, 14 Pro Max | Primary tier — required for iPhone apps. Auto-scales down to every smaller iPhone class. |
| 6.5" | 1284×2778 · 1242×2688 | iPhone 14 Plus, 13/12/11 Pro Max, 11, XS Max, XR | Required only if you do not provide a 6.9" set. |
| 6.3" | 1206×2622 · 1179×2556 | iPhone 17 Pro/17, 16 Pro/16, 15 Pro/15, 14 Pro | Optional — otherwise scaled from 6.5". |
| 6.1" | 1170×2532 · 1125×2436 · 1080×2340 | iPhone 14/13/12/11 Pro, 13/12 mini, XS, X | Optional — otherwise scaled from 6.5". |
| 5.5" | 1242×2208 | iPhone 8 Plus, 7 Plus, 6s Plus | Optional (legacy). |
Source: Apple — App Store Connect screenshot specifications.
Frequently asked questions
Why does App Store Connect say the dimensions of one or more screenshots are wrong?
Because at least one uploaded image doesn't match one of Apple's exact accepted resolutions for that display size. App Store Connect validates dimensions precisely, so being off by even a single pixel, or uploading to the wrong size slot, triggers the error.
What size fixes the error for iPhone screenshots?
Use the 6.9-inch iPhone size: 1320×2868 px (also accepted: 1290×2796 or 1260×2736). A 6.9-inch set is required and auto-scales down to every smaller iPhone, so it resolves most dimension errors.
Can a transparent PNG cause the wrong-dimensions error?
Yes. Screenshots must be flattened RGB with no alpha channel. Re-export as a flattened .png or .jpg (no transparency) at an exact accepted resolution.
How do I resize my screenshots to the correct App Store size?
Resize or re-export each image to one of the exact accepted resolutions, flattened with no transparency, then re-upload. mockscreens does this automatically — it exports every required App Store size at the correct pixel dimensions.
Fix wrong dimensions in one click.
Drop in your screenshots and mockscreens exports every App Store size at the exact pixel dimensions Apple requires — flattened, no transparency, ready to upload. Free to start.