Now many people uses Ipad, smartphone, galaxy tab or iphone to read pdf books.
But do you feel troublesome of adjusting the area of the view page?
if you've same troubles with me, maybe you can try to use the software below.
You may convert the PDF, HTML, TEXT, XML files to ePUB.
ePUB will automatically assist you to re-arrange the text to suit in your screen.
If you don't know what is ePUB. Maybe you can know more in Wikipedia.
You can download PDF to ePUB converter in below link (It is trial up version, but you're able to convert the files to ePUB with no troubles)