Favicon are every useful for visual grepping: we use them pretty much every day to quickly find a website in your bookmarks or to remember what a specific tab is about! Recently, I needed to convert a .png into a favicon, I knew that ImageMagick could handle this, here is the command line I used:

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convert McTrickle.png -define icon:auto-resize=128,64,48,32,16 favicon.ico

ImageMagick ➡️ 👍 🏆!