A-PDF Page Crop(http://www.a-pdf.com/page-crop/index.htm) is an easy to use page cropping utility program that helps you to trim the PDF pages, remove the redundant margins. This video will show you how to use the software to crop pages. See more: http://a-pdf.com/faq/how-to-remove-the-pdf-margin-so-as-to-read-it-conveniently-on-ipad-or-iphone.htm