PDF Stamp lets you stamp watermarks such as "Confidential" on pages that include sensitive information or "Draft" on a preliminary PDF document to be distributed for review. You can stamp PDF document names, revision numbers, Date/Time stamps, pages numbers, contact information or any text that you need added to the file. 

    With the JPEG image support you can stamp company logos, author signatures, products, charts or any artwork in JPEG format. A Scale feature is provided with image stamping to easily increase or decrease the size of the stamped image, leaving the original image size intact.    

• Easy to use
• Does NOT need Adobe Acrobat software 
• Supports PDF1.5 protocol (formerly only supported by Acrobat 6.0) 
• Windows 98, ME, NT, 2000 and XP support
• Supports stamp to the page header and page  footer
• Supports image stamp (JPEG/TIFF/PNG images)
• Supports text stamp
• Supports graphics  stamp (Line and Rectangle) (In the future version)
• Output file (-o) — Duplicates the original file with the file name you specify. Stamps are placed in the duplicate file, leaving the original copy unchanged
• Stamp pages using the standard Base 14 fonts and system fonts
• Supports Font Style, Font Size, Text Modes (solid, outline), Grayscale and RGB Color (0-255 RGB color values supported)
• Top, bottom, vertical center, diagonal-top left and diagonal-bottom left
• Stamps can be placed in the exact vertical center of a page (or the exact vertical center within a individual stamping space)
• Enabling you to easily position the stamp in any location on the page
• Stamp on Top of or Underneath the original PDF document page contents
• Text can be stamped on any angle. Any positive or negative numbers, including decimal numbers may be used to specify an angle in degrees
• Specify Start and Ending page numbers
• As an alternative to specifying static values for the text, you can use stamping variables to stamp dynamic data. Dates, times, page numbers, file names are just a few of the variables available. See the PDF Stamp documentation for a listing of all Stamping Variables.
• Supports multiple line text stamps within one stamp item
• JPEG/TIFF/PNG image size can be increased or decreased. No need to adjust the image size in another application before the stamp
• Wrap text to a new line if it would otherwise be too long to fit in its margined area
• Supports links (web links, go to page, open file, go to remote page)
• Justification (it's only available for multi-line texts)— left, right, or center