Windows 11 scale factor	100%	125%	150%	200%	250%	300%	400%
Context menu, title bar, system tray	16px	20px	24px	32px	40px	48px	64px
Taskbar, search results, Start all apps list	24px	30px	36px	48px	60px	72px	96px
Start pins	32px	40px	48px	64px	80px	96px	256px

Note

Apps should have, at the bare minimum: 16x16, 24x24, 32x32, 48x48, and 256x256.

This covers the most common icon sizes, and by providing a 256px icon, ensures Windows should only ever scale your icon down, never up.