It is often necessary to apply a “watermark” or “stamp” to the pages of a PDF. A common reason for this is to identify a provisional document by stamping each page with a message such as “DRAFT” or “PRELIMINARY”.

TopLeaf provides two different methods for achieving this:

  1. By using an overlay fixed block to place the watermark on the page and controlling its content with mappings.

  2. By defining the watermark to be used in the PDF profile.

Each of these methods has different capabilities and limitations. The following table compares the two approaches.

Using overlay fixed blocks Using a PDF profile
Requires changing layout and mappings. Layout and mappings are not affected.
Enabling and disabling the watermark requires changes to the data composed by TopLeaf. Watermark is controlled by selecting the appropriate profile; data is not affected.
Watermarks may vary depending on the page content. Watermarks may be selected by page number, but not page content.
Some page content may obscure part or all of the watermark. Watermark can be placed either over or under page content.
No transparency or blending is supported. All of the transparency and content blending allowed in a PDF is supported.
Text can only be rotated by multiples of 90 degrees (other rotations can only be achieved by creating a graphic from the text). Text can be rotated by any angle.
Any font may be used for text. Only standard PDF fonts (Helvetica, Times, Courier) are supported.
Must be positioned within the print area defined in the layout. Can appear anywhere on the page.

To control the watermarks that are applied when a profile is selected, choose the Watermarks tab in the profile editor.