It has a crop-margins feature for reading PDFs that (for most documents) makes the text size slightly larger than it would be printed on letter sized paper. It'

It has a crop-margins feature for reading PDFs that (for most documents) makes the text size slightly larger than it would be printed on letter sized paper. It's pretty seamless. For two column documents there's a "quarters" reading mode. It's not a great experience for a PDF with no margins and a complicated layout (like some magazines.)