Make image sharper

Hi i uploaded an image but when it transferred to my squarespace webpage, it was bigger than it should be. I've edited it but it's still fuzzy. I think making it smaller will help. How do i do that.

Spacer blocks, most underrated block you can use. Put them on left and right side if needed and adjust, they will reduce the size of the image block. An image always tries to fill the size of the image block no matter the pixel size of the image itself. Which is why it can get fuzzy.