ZoomIt is a free tool from Microsoft that allows you to zoom in on parts of your screen, and also draw on the screen. This tool is super light weight and will not slow down your computer, or take up much space. It is a single executable file so no installation required.
A few things that are kinda bad about the program that I don’t explain in the video, or not in depth are the limitations of it. I understand it isn’t a large program but not being able to adjust simple items like Pen Color and Pen Size do make other programs a little more appealing. But ZoomIt is so small, light weight, and doesn’t require installation it is hard to say no to it.