pageres
Capture website screenshots
...No need for a wrapper plugin. pageres offers a wide variety of options, for example, you can Delay capturing the screenshot, which is useful when the site does things after load that you want to capture. You can also apply custom CSS to the webpage, and specify some CSS or the path to a CSS file. Or apply custom JavaScript to the webpage. You can set background color to transparent instead of white if no background is set. You can also pass in the w3counter keyword to use the ten most popular resolutions from w3counter.