Auto HD For YouTube is a handy Chrome extension that allows YouTube videos to be played automatically in HD.IT provides a very simple way to select from HD Max, 1080p, 720p, as well as several other sizes, are available for each video. There are also 2 options for player size to choose from, keeping it simple but effective. Auto HD For YouTube is a very easy to use extension specifically designed to enhance play quality - no bells, no whistles just HD video.