App Icon Generator

Generate complete sets of app icon assets for iOS, macOS, Android, and web/PWA from a single source image. Uses ImageMagick to resize and export icons in all required sizes, with optional Xcode-compatible .appiconset output.

Prerequisites

• ImageMagick must be installed: brew install imagemagick
• Source image should be at least 1024x1024 pixels and square (1:1 aspect ratio)

Workflow

1. Validate the Source Image

Before generating icons, verify the source image meets requirements:

• Confirm the file exists and is a valid image format (PNG, JPEG, SVG, TIFF)
• Check dimensions are at least 1024x1024
• Warn if the image is not square — icons will be force-resized to square
• PNG is preferred (lossless); JPEG is acceptable but may introduce artifacts at small sizes