It’s built into the OS..not familiar with Windows but also not sure how it could be easier. Command+shift+4 gives a crop tool. Push space to select a window instead. Swap the 4 for a 3 for full screen. Bitch’n pistol though!I may be the only person that hates doing screen shots on my mac...so much easier on non apple stuff (I'm stubborn...give me a Commodore VIC20 and I'll program the hell of that BASIC shit), it's quicker for me to take a pic of my screen with my iphone than look up how to take, crop and paste and save on my MacBook. It's so much easier on my PC