merge many PDF documents into a single document
split a PDF document into pages
create visual watermark on a PDF document
extract text from a PDF document to a text file
attach files to a PDF document
password protect PDF files
PDF metadata editor
supports Save as WWF
standalone software (please check requirements)
Adobe Acrobat or Adobe Reader not required
can handle password protected PDF documents
easy to use user interface
the original PDF file will always remain intact, in case of error you won't lose anything