Pdf pages are usually based on A4 size which is 210mm wide. Even at full size the writing is often tiny. Once rendered on a 10cm wide screen (landscape) it's pr

Pdf pages are usually based on A4 size which is 210mm wide. Even at full size the writing is often tiny. Once rendered on a 10cm wide screen (landscape) it's pretty darn hard to read. Also in general the mobile pdf reading experience sucks. For example you have to download a file (rather than browse to) on Android and the hunt it down to open it. The pdf readers I've used easily accidentally scroll you to a random page if you make a mistake in where you touch the screen. Kindles probably the best but then you have to email yourself the pdf which is a hassle.