PDFtk Server is our command-line tool for working with PDFs. It is commonly used for client-side scripting or server-side processing of PDFs. It is also used by OEMs and ISVs to give their products the ability to manipulate PDFs. A commercial license is required to distribute PDFtk with your commercial product.
If PDF is electronic paper, then pdftk is an electronic staple-remover, hole-punch, binder, secret-decoder-ring, and X-Ray-glasses. Pdftk is a simple tool for doing everyday things with PDF documents.