title: How to merge PDFs to a single file without multiple copies of the same font?
body: <p>I create PDFs and concatenate them into a single PDF.</p>
  
  <p>My resulting PDF is a lot bigger than I had expected in file size.</p>
  
  <p>I realised that my output PDF has a ton of duplicate font, and it is the reason of unexpectedly big file size.</p>
  
  <p>Here, my question is:</p>
  
  <p>I would like to create PDFs which only embed font information, so let they use Windows System Font.</p>
  
  <p>When I merge them into a single PDF, I insert actual font which PDF needs.</p>
  
  <p>If possible, please let me know how to do it.</p>