Yannick
Specification workflow
Build once, validate every required set
Choose a source size
Start from the largest required canvas for each device family.
Prepare localizations
Keep copy and product UI appropriate for every market.
Run export QA
Check format, dimensions, alpha, order, and readability.
Upload checklist
- Upload one to ten screenshots for each supported device set.
- Use JPEG, JPG, or PNG files accepted by App Store Connect.
- Plan screenshots around the largest required display sizes first.
- Check each localization before submitting a new app version.
- Keep screenshots visually consistent with app previews and the icon.
Create App Store screenshots from the spec
The key App Store screenshot rules
Apple's screenshot specification reference lists the accepted device sizes and says each set can include one to ten screenshots. App Store Connect accepts JPEG, JPG, and PNG screenshots. Apple also notes that if the UI is the same across device sizes or localizations, you can provide the highest-resolution screenshots and let Apple scale down for smaller sizes.
Design before exporting
The spec tells you what files are accepted, but conversion depends on the story. Build a screenshot set around the first three frames: problem, product proof, and outcome. Then export the same system across iPhone, iPad, and localized variations instead of rebuilding each size manually.
Current iPhone source sizes to know
Apple's current 6.9-inch portrait specifications include 1260 × 2736, 1290 × 2796, and 1320 × 2868 pixels, with the dimensions reversed for landscape. The 6.5-inch set includes 1242 × 2688 and 1284 × 2778 pixels. Check Apple's live specification table before every release because supported devices and accepted mappings can change.
When the UI is identical across sizes, App Store Connect can scale the highest-resolution upload down to smaller device sizes. Treat that as an upload convenience, not a reason to skip visual QA: type, device frames, and safe margins still need to look intentional at every displayed size.
Final pre-upload quality check
- Export JPEG, JPG, or PNG files without an alpha channel.
- Keep every screenshot in a set in the same orientation.
- Read the smallest caption at the actual store-preview size.
- Make the first three screenshots work as a complete mini-story.
- Verify localized copy and localized in-app UI together.
Format
Use accepted JPG, JPEG, or PNG files.
Count
Prepare one to ten screenshots per set.
Order
Put the clearest value proof first.
