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 command-line tool for doing everyday things with PDF documents. Keep one in the top drawer of your desktop and use it to: Merge PDF Documents, Split PDF Pages into a New Document, Fill PDF Forms with FDF Data and/or Flatten Forms, Apply a Background Watermark, Report on PDF Metrics such as Metadata, Bookmarks, and Page Labels, Update PDF Metadata, Attach Files to PDF Pages or the PDF Document...