title: How to flatten already filled out PDF form using iTextSharp
body: <p>I'm using iTextSharp to merge a number of pdf files together into a single file.</p>
  
  <p>I'm using method described in iTextSharp official tutorials, <a href="http://itextsharp.sourceforge.net/examples/Concat.cs" rel="noreferrer">specifically here</a>, which merges files page by page via PdfWriter and PdfImportedPage.</p>
  
  <p>Turns out some of the files I need to merge are filled out PDF Forms and using this method of merging form data is lost.</p>
  
  <p>I've see several examples of using PdfStamper to fill out forms and flatten them.</p>
  
  <p>What I can't find, is a way to flatten already filled out PDF Form and hopefully merge it with the other files without saving it flattened out version first.</p>
  
  <p>Thanks</p>