Which sizes are created
favicon.ico holds 16, 32 and 48 px images for browser tabs and bookmarks. apple-touch-icon.png (180 px) is used by iPhone and iPad when the site is added to the home screen; iOS does not accept a transparent background, so this tool always gives it one. android-chrome-192x192 and 512x512 are used by the manifest for Android and PWAs, plus one 512 px maskable icon with a safe zone so it isn’t cut off by each device’s icon shape.
A site.webmanifest file and ready-to-paste <link> lines are created too. Put all the files in the site root or in the folder you enter in the path field, then paste the code into <head>.