What a nice application I’ve just found on MacThemes forums. It’s called Hobiconer and it’s a free app by Jérémy Marchand that lets you create, import and export icon in many formats: .icns (Apple ...

Then, click the three-dotted icon that is known as Settings and more button. After that, go to Favorites and select the Import option. Now you can find a pop-up window, where you need to choose ...