Steps to take full-page screenshots in Chrome:

Step 1: Main Menu (three vertical dots) in the top-right corner > More tools > Developer tools

Step 2: Press “Control+Shift+P” in Windows & Linux or “Command+Shift+P” in Mac.

Step 3:  Write and select “Capture full size screenshot”.

After we have done that, we should get a PNG as a screenshot for the full page.

Source: https://hackernoon.com/how-to-take-full-page-screenshots-in-chrome-without-extensions-be2f0cf36df1