64.23 PDF Watermarks
20200429 To add a watermark to a PDF file we can use pdftk with it’s background, stamp, and multistamp operations.
The process begins by creating a single page (for example, using
libreoffice) containing the watermark. The watermark might
simply be some grey text at the top and bottom of the page. The page
margins may need to be adjusted to get the text exactly where you want
it to appear. Export the document as pdf, perhaps
Suppose the document you want to watermark is called
survivor.pdf. To add the watermark as an underlay to each
page of the pdf document:
$ pdftk survivor.pdf background watermark.pdf output survivor_watermarked.pdf
The stamp operation places the watermark on top of each page, thus possibly occluding parts of the original page.
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