: This free builder and resizer supports .jpg and .png files. It allows for customization of the foreground and background with solid colors, gradients, and shadows before exporting for macOS or iOS.
If you prefer not to download a dedicated app, these browser-based tools are excellent for generating Mac icon sets: Icon Composer - Apple Developer App Icon Generator for Mac Free Download
: While it has a pro version, the free version provides a fast way to customize icons for files and folders by simply dropping an image onto the app. : This free builder and resizer supports