App Screenshot Generator for iOS and Android: Design Once, Export Twice

If you ship on both iOS and Android, you need two screenshot sets from one story. An app screenshot generator is worth using when it treats both storefronts as first-class targets — because the stores do not ask for the same things.

Two stores, two kinds of rules

Apple validates exactly. Every iPhone and iPad display class has fixed accepted dimensions, PNG or JPEG with no alpha, and one to ten screenshots per class. If a pixel is off, App Store Connect refuses the file.

Google Play validates by range. Phone screenshots just need each side between its minimum and maximum pixel bounds, with an aspect ratio no wider than about 2:1, and one to eight images. The catch is coverage: Google expects screenshots across different device types, so you also export for 7-inch and 10-inch tablets and Chromebook, in the right orientation. Google recommends at least four phone screenshots at 1080 x 1920 or larger for surfaces where it may feature your app. And the feature graphic — 1024 x 500 — is a separate asset with its own rules, not a resized phone screenshot.

A decent generator encodes both styles of rule: exact-match validation for Apple targets, range validation for Google targets, and a warning list before you export.

The trap: one flat image scaled everywhere

The fastest way to a bad set is designing at one size and stretching it. A 9:16 iPhone composition squeezed into a tablet canvas pushes your caption into the safe zone, stretches the device frame, and blurs interface text. Google's large-screen targets mix portrait and landscape; a single flat image cannot serve them.

Design at a master size, then re-lay-out per target class. Keep the headline, the app screen, and the margins in sensible relationships as the canvas changes. Inspect every export; a two-second manual nudge beats automated distortion.

What to check before committing to a tool

• Both stores in the target list. iPhone classes, iPad classes, Android phone, 7- and 10-inch tablets (portrait and landscape), Chromebook, feature graphic.
• A requirement source with dates. Size rules change when stores add devices. The tool should show what it validated against and when it was last checked.
• Format safety. PNG/JPEG output without alpha, since neither store accepts transparency in listing screenshots.
• Set consistency. One template applied across every target, so the iOS and Android listings read as the same product.
• Batch export with naming. File names that carry store, device, language, and index save you an afternoon of mix-ups.

If you only ship iOS for now, the same logic applies in a simpler form — see App Store Screenshot Generator.

A workflow that ends with two uploads

1. Write the story for your set first: outcome, proof, difference, routine. The first screenshot carries the most weight, so decide its promise before opening any tool.
2. Build the set at the master canvas with real screens from both apps where they differ.
3. Select both storefronts and every device class you support as export targets.
4. Review each target after scaling, not just the master.
5. Export, verify dimensions and counts against Apple's specifications and Google Play's asset requirements, then upload.

You can run this workflow in our editor with the size catalog already built in, or start from templates that keep both stores visually consistent.