Looks like a wonderful tool for non-designers who need quick mocks for slide decks and one-off graphics.
FYI, you can take full-page / viewport sized screenshots with Chrome Dev Tools: https://developers.google.com/web/updates/2017/04/devtools-release-notes#screenshots
Dev Tools also comes with a bunch of presets for common viewports and you can add your own custom ones too.
This just gives me a screenshot LOL, I thought it would be more. For people who wants an editable mockup, checkout https://huu.la
A screenshot placed in a mockup. ;)
Closed it after 1 minute of random loading messages. :/
Sorry, there were hundreds of people generating screenshots at the same time. We scaled our servers up and now a screenshot takes around 6-7 seconds. Sorry for the inconvenience!