title: Gluing (Imposition) PDF documents
body: <p>I have several A4 PDF documents which I would like (two into one) "glue" together into A3 format PDF document. So I will get from 2PDFs <strong>A4</strong> a single one sided PDF <strong>A3</strong>.
  I have found the excellent utility <a href="http://www.pdfhacks.com/pdftk/" rel="noreferrer">PDFToolkit</a> and some others but none of them can be used to "glue" side by side two documents. </p>