Use the website as a browser tool
The page generates the grid inside its own canvas. It does not change Chrome settings, add a toolbar, or draw lines over other tabs, and it does not need access to your browsing history.
For a blank worksheet, no photo is required. You can focus on paper shape and spacing, then save a normal image file that other applications can open.
Print the downloaded image, not the whole webpage
Printing the webpage can include navigation, controls, and explanatory text. Download the PNG first so your print application receives only the grid image you actually want on paper.
Select the intended paper size and inspect the print preview for unwanted scaling or clipping. If the line spacing must be physically accurate, make one test print and measure it before repeating the job.