Which emojis can I convert to ICO?

Any standard Unicode emoji can be converted — faces, objects, flags, symbols, and more. The tool renders the emoji using your system font, so the exact appearance depends on your operating system's emoji style.

Will the emoji icon have a transparent background?

Yes. The emoji is rendered on a transparent canvas, so all ICO sizes will have a transparent background. The emoji itself appears as the icon with no solid colour behind it.