Click on 3 vertical dots on the top right hand side of the browser. Click on 3 vertical dots again in the Developer Tools Menu and choose "Run Command" option or use keyboard combination ctrl+Shift+P. If you do not see Developer Tools you might have to go to chrome settings and enable this option in your chrome browser. Now type "Capture Full Page Screenshot" in the command bar. Thats it. You should now see the whole page you are viewing will be downloaded automatically in your PC as a PNG file.