Are you still doing manual screenshots or ad preview using photoshop or powerpoint? Now you can use Adzymic Smart Previewer Chrome Extension to preview HTML 5 ads in real publisher's environment. It is fast and easy.
This Chrome extension allows user to select the ad container of a particular web page and replace it with a creative ad tag. User can specify the dimension of the ad. Once the creative ad tag is placed, the ad will be shown on the selected ad container. User can then take a screenshot and download the screenshot as png.