pdf-swiss-knife is a web based service that works at simplepdf.com It is used to perform various commands on PDF files that you would upload here. It is a wrapper for Sid Steward's pdftk tool (www.accesspdf.com)

To use the pdf-swiss-knife you do not need to do anything at the website OTHER THAN buying some space to place PDF files there. What you do need to do is to download and use a small utility (called the swiss-knife-uploader) that manages your account directly from your computer.