App Store Screenshot Size Checker

A familiar aspect ratio does not prove that a screenshot has the right pixel dimensions. A small image can have exactly the same shape as a large accepted image. We report the decoded width and height, then match both portrait and landscape orientations against the catalog. The report also records the file format and original byte size, so you can compare individual assets without opening an image editor.

The catalog covers the iPhone and iPad targets used by this site. It is not a complete validator for every Apple platform. A file without a match is flagged for investigation rather than described as universally invalid. Device targets whose upload availability is not yet confirmed are excluded from matching.

Choose up to eight PNG, JPEG or WebP files, with a maximum of 20 MB per file and 80 MB for the batch. WebP can be inspected, but it is flagged because it is not a supported App Store screenshot submission format. Processing happens locally in your browser. Large decoded images above 32 megapixels are rejected to keep the task manageable.

Run the check, review every file card, and download the JSON report if you want a record for a release checklist. The cards name matching device presets and explain issues individually. An unreadable file stops the batch with its filename, so you can replace that file and rerun the check.

A PNG can look solid while still carrying an alpha channel. The checker reads the PNG color type and looks for transparency metadata, including a tRNS chunk used by some indexed images. It does not infer channel structure from a thumbnail or from whether you can see a checkerboard background. That distinction matters when a store expects an image without alpha.

If alpha metadata is present, use the screenshot resizer to flatten and re-encode the image as JPEG or RGB PNG. Check the downloaded file again. Flattening resolves a file-format concern, but it cannot remove private information, placeholder copy or misleading product claims from the image.

This tool cannot tell whether a screenshot shows a real feature, whether a headline is truthful, or whether the captured interface matches the device you support. A phone capture resized to an iPad canvas is still a phone interface. File dimensions and the product experience are separate checks, and both deserve attention before submission.

Use the result as one part of your release review. Confirm the required device classes in your own App Store Connect listing, inspect the official specifications, and open the actual exported images at a readable size. Keep a clean copy of your source captures so format fixes do not force you to recreate the design.