When you paste a screenshot in Word and adjust the dimensions, the image will often become blurry. In order to paste a high-quality screenshot in Word, you should alter the dimensions in a photo editor first.
To be as accurate as possible, enter a number that is a multiple of the original resolution. This helps you avoid ‘broken’ pixels. For example: if the original resolution is 96 ppi, use 192 ppi (96 x 2) or 384 ppi (96 x 4).
Be sure to check if the resolution is shown in pixels/inch (ppi) or in pixels/centimeter (ppc).