Free App Store screenshot tools
Two small tools that fix the two things App Store Connect rejects most: wrong dimensions and a stray alpha channel. Both run entirely in your browser — your files never leave your machine, and there is no signup.
Updated July 2026
Free tool
Screenshot size checker
Drop a screenshot and see instantly whether it matches an accepted App Store size, which device class it maps to, and what App Store Connect will call it.
Free tool
PNG alpha channel fixer
Converts a PNG to colour type 2 (RGB, no alpha) so App Store Connect stops rejecting it with IMAGE_ALPHA_NOT_ALLOWED — and verifies the output.
Skip the fixing — get screenshots that are right from the start
ScreenshotPunch generates your whole App Store set from your raw screenshots: art-directed layouts, headlines in every locale, exact 1320×2868 exports with no alpha channel. Pick a style and it builds the rest.