Edit your PDF files! You can write annotations, change the text (correct spell errors) or delete words completely. You are able the change the order of the pages or delete pages. Also you can hide the information on a page so that they are invisible in the Acrobat Reader and you can show them later. You can change the page size or move the content. Add stamps like "Confidential" or "Top secret". The source code of the page (a language like HTML) is also editable for you. The program can rewrite the complete PDF file and not only update them,
so you can smaller PDF files. The program leaves the layout untouched after saveing if you don't want to change it.
OK, so you want to stamp your document. Maybe you need to give reviewers some advice about the document's status or sensitivity. This tip from author Ted Padova demonstrates how to add stamps with the Stamp Tool along with related comments.