App Store Screenshot Generator: Turn Real Screens Into Store Assets

An App Store screenshot generator is a tool that takes your real app screens and a headline, then exports finished images at the exact pixel sizes App Store Connect accepts. The value is not the "AI" part. It is that one design produces every device class you need, without you memorizing dimensions.

The problem it solves

Apple does not accept "close enough". Each display class has exact accepted dimensions. A 6.9-inch iPhone screenshot is 1320 x 2868 or 1290 x 2796 pixels, a 6.5-inch set is 1284 x 2778 or 1242 x 2688, and a 13-inch iPad is 2064 x 2752 or 2048 x 2732. Files must be PNG or JPEG with no alpha channel, and each device class takes one to ten screenshots.

Doing this by hand in a general design tool means tracking a spreadsheet of canvases, exporting each one, and checking every file before upload. A generator holds that requirement list for you, so the canvas, the export, and the validation all come from the same source.

What a generator actually does

The honest workflow has four steps:

1. Pick the store and device target first (for example, iPhone 6.9-inch portrait). The canvas is created at the accepted size, not scaled later.
2. Place real app screens into the frame. Crop and position them so the useful action stays legible.
3. Add one caption per image. The headline sells the outcome; the screen proves it.
4. Export. The tool outputs files that match the target's exact dimensions and format rules.

Some tools stop at step 4 with a flat template. Better tools keep editing open after generation: you can change the headline, swap a screen, or adjust the frame without starting over.

What to look for when choosing one

Before trusting a generator with a release, check:

• Current size presets. Does the tool list accepted dimensions with a source and a review date? Apple changes the device classes over time, and a generator built on a two-year-old size table will get your set rejected.
• Format control. PNG and JPEG output, no alpha, correct file naming that identifies store, device, language, and position.
• Consistency across the set. All screenshots should share background, font, and spacing. Templates that enforce this beat freehand design in a generic tool.
• Real screens only. A tool that invents plausible-looking interfaces is a liability. Apple reviews whether images depict the actual app experience.
• Proof before upload. Preview the set as a strip and at full size, so you can catch repeated captions and unreadable type.

Generic design tools can produce the same artwork if you maintain the size list yourself. A generator earns its keep when you publish often and want the requirements enforced rather than remembered.

Where a generator does not help

It cannot decide what your first screenshot should say. The message question — what gets easier for a person who installs this app — comes before any tool. We cover that separately in Your First App Store Screenshot Has One Job, and the dimension details live in App Store Screenshot Sizes.

A generator also cannot tell you which variant performs better. App Store Connect product page optimization exists for that; the tool's job ends at correct, consistent files.

A short setup checklist

1. Confirm your app's supported display classes in App Store Connect screenshot specifications.
2. Choose one template style and apply it to the whole set.
3. Capture a real screen for each claim you plan to make.
4. Write the captions as promises first, polish second.
5. Export, then verify every file's dimensions and format before upload.

If you want the size catalog handled for you, try the workflow in our editor or start from screenshot templates.