The first free PDF editor online. Use PDF Hammer to quickly and easily edit PDF files online, without needing to install anything. Upload your PDF file(s) to PDF Hammer from your Web browser, perform your edits, and then download back to your computer. The visual editor lets you see the pages of the PDFs as you edit them.
Combine PDF files.
Rearrange, reorder and delete pages.
Lock your PDF files with password-based security.
Add and edit document information (metadata) fields, including author, title, subject and keywords.
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.