title: Reliable way to (programmatically) compare PDFs?
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/145657/tool-to-compare-large-numbers-of-pdf-files">Tool to compare large numbers of PDF files?</a>  </p>
  </blockquote>
  
  
  
  <p>I am in the classic scenario where the business gives you a bunch of <em>new</em> pdf forms for the new year with no revision notes whatsoever and you are supposed to figure out what's different from the previous year ones.</p>
  
  <p>I am talking loads of forms here, so I am trying to find a way to compare PDFs to outline differences without having people to manually go through each and every one of them. </p>
  
  <p>My idea was to extract all the text from the PDFs and dump it into a .txt then run differences on text files, but it sounds horrible.</p>
  
  <p>My question says programmatically, but I'd be happy with any reliable tools for comparing PDFs, and mainly looking to get an idea from people experiences. Also willing to entertain any programmatic solutions (preferably in C# but pls shoot out <strong>any</strong> ideas).</p>