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Browser-based tool generates App Store and Google Play screenshot sizes in one ZIP

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A developer built a screenshot generator that runs entirely in the browser, letting users upload raw simulator captures and add captions and backgrounds. The tool exports every required store size as a single ZIP file, with no images uploaded to a server. The project tackles several hurdles, including keeping up with App Store and Google Play size specifications and ensuring exports contain no alpha channel. The developer copied the presets from Apple's and Google's official pages and recorded a verification date in the code. The write-up also covers laying out one design across different aspect ratios and naming files for easy upload.

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