One Logo, Every Platform: How to Ship App Icons in One Go

Designing an app icon often starts with one simple file: a logo on a 1024×1024 canvas. The trouble starts after that. A real app does not need just one icon. It needs a complete set for iPhone, iPad, macOS, Android, and the web. Each platform expects different sizes, different filenames, and in some cases different rules. The most common example is transparency. https://medium.com/@chris.ahrweiler/one-logo-every-platform-how-to-ship-app-icons-in-one-go-dc785f47bf0e