Iconize is a macOS app that can be used to customize the icons of applications, folders, or files.

Program features:

• Easy to use: Just drag and drop your icon image, and Iconize automatically handles the rest. You can use any image format supported by Mac.
• Configurable icons: You can add rounded corners and/or padding to comply with relevant design guidelines.
• Fast performance: With the performance advantages of Mac, the icon customization process can be completed quickly.