You can drag the ruler to any position on the screen, to line up the zero mark with the left edge of the object that you want to measure. You can find this tool useful when you have to upload a picture that's a specific measurement, such as a blog banner, or profile photo. The best thing about this online ruler is the fact that you don't have to download it! How to use online pixel ruler Need to measure distance on the screen? This online free pixel ruler tool will help you to measure the horizontal, vertical and even diagonal distance / length.
