How to Create App Store Screenshots That Explain Your App

An effective screenshot sequence makes the app's purpose understandable before asking someone to read a description. Start with real screens, pair each with one specific benefit, and check legibility at phone size. A device mockup can add context, but it should not make the interface harder to see or misrepresent the product.

Disclosure: this guide is prepared by the team building FastMockup. We have not measured a conversion increase from the layouts below.

Start with three reusable layouts

You do not need ten different visual ideas. A compact sequence is easier to produce and compare. Use the following original layouts as a starting point, then replace every example with something your app actually does.

1. Outcome first: a short benefit headline at the top, one large screen underneath. Example for a calendar app: “See your week in one place.”
2. Proof of workflow: a real screen showing the action behind that benefit. Show the relevant controls rather than a decorative home screen.
3. Useful detail: highlight a secondary capability that answers an objection. Avoid unsubstantiated claims such as “the fastest” or fake social proof.

Keep typography, background and device finish consistent. A different background on every slide can make the sequence feel like several unrelated products. Leave enough room for translated copy; German or French text may need more space than the English original.

Build the mockup

Capture the app at an appropriate source resolution, remove personal data, and keep a clean copy of the original screen. Open the FastMockup device mockup editor, choose the device and add your screenshot. Use Photos for a still composition, position and rotate the device, and choose the background before adding text.

For a storefront asset, prioritize the screen. Large rotations that look impressive on a launch video can make small interface text unreadable in a still. Start nearly front-on, then add only enough tilt to give the device depth. Export PNG when you need a transparent intermediate; flatten it against the intended background before submitting wherever required.

Check dimensions against the destination

Do not assume a social image preset is also an App Store preset. Apple publishes accepted screenshot dimensions by device/display category. Check the live App Store screenshot specifications before upload. FastMockup's portrait export is a convenient canvas, not a guarantee that an image meets every listing requirement.

Inspect the actual exported file at normal viewing size, not just the large editor preview. Look for cropped buttons, distorted text, unreadable labels and accidental private data. Review each localization independently rather than shrinking long headlines until they fit.

Measure after launch

Change one meaningful element at a time: headline, first screen or framing. Record the version and the period it was used. A prettier mockup is not proof of a better conversion rate; use your storefront's measurement tools and an appropriate test design before drawing that conclusion.