Simply the best!

This plug-in is legit! I’ve been using their site for a while, and noticed they finally created a WordPress plug-in. This gives you great control over how you want your favicon to look on various devices. Don’t overlook these perks — as they’ll help your site stand out from the others that simply use just one packaged ICO file. This one generates everything you need for you.

Just spend the few minutes it takes to create the options of your choice. I’m sure they’ll also keep this plug-in up to date with any new standards and sizes.