title: Ghostscript to merge PDFs compresses the result
body: <p>I found this neat command to merge multiple PDF into one, using Ghostscript:</p>
  
  <pre><code>gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -sOutputFile=out.pdf in1.pdf in2.pdf
  </code></pre>
  
  <p>The resulting size is smaller than the combined size of the 2 PDFs.</p>
  
  <p>Running the command with a single file as input still results to a smaller size output file.</p>
  
  <p>Is there an option on Ghostscript to just copy the pages as they appear on merging without doing any compression?</p>
  
  <p>If not, is it possible that the Ghostscript compression is so good that it will result in absolutely no loss in quality? </p>