Convert PNG to ICNS

Will convert a PNG image file to an ICNS format that can then be used as a MacOS Icon. The user can decide which sizes of the image are to be included from the following sizes in pixels:- 16×16, 32×32, 64×64, 128×128, 256×256, 512×512, 1024×1024 At least one size must be chosen, but by choosing all, this should ensure that the icon displays correctly across a wide range of contexts and display resolutions. On conversion the image will be saved to the default downloads folder with the name of the original image, but with ICNS appended. If the input PNG image file is not square, that is, the width & height are not the same, the user will be warned, as the resulting images in the ICNS file could be distorted. There is a companion Chrome extension "Image to Square or Circle PNG" that can be used to turn an image file into a square sized PNG file. Of course, the user can use any preferred App to achieve a square sized PNG. This extension is free of fees and adverts, and user data is not collected or processed.