At work, I needed a way to compare PDFs. I stumbled across the XPDF toolset sometime ago. What I wanted was a utility that I could pass two PDFs into and have them rendered as text for a text-based comparison in WinMerge. Now, WinMerge does have a plugin that provides PDF comparison, but I am not thrilled with what it does to the layout. At least pdftotext.exe maintains an assemblance of the layout (provided you use the appropriate args). That said, here is the script that I'm using. It will