The Acrobat JavaScript model provides two watermark functions that have just as many options as the watermarking tool shown in Figure 1. If more flexibility is required- for example, if different text or images need to be applied to different documents- then the only solution is JavaScript.
Create watermark in pdf pdf#
Once set, the watermark is applied to all PDF files using the same parameters.
However, the watermark settings have to be set by hand. If a watermark needs to be applied to more than one PDF, it can be automated through an Action. This feature allows the form creator to add dynamic content to the PDF with only Acrobat Professional and JavaScript. However, the most useful feature is that OCGs can be turned on and off with a script, as shown in the Creating and Using Layers (OCGs) with Acrobat JavaScript article.
OCGs allow page content to be turned on and off based on parameters such as the zoom level. When Acrobat creates a watermark, it places the watermark content into an OCG (optional content group), more commonly referred to as a PDF layer. This rich feature set means that the Acrobat watermarking tool can be used to add logos, overlays, backgrounds, headers, footers, special marks or any other kind of (post-creation) content to a PDF.įigure 1 – The watermarking tool provides a wealth of optionsīut there’s more. The Acrobat watermarking tool (Figure 1) allows the user to select the location, page range, opacity, scaling and many other parameters. Nearly any type of static content (text, image files and pages from another PDF) can be applied to a PDF as a watermark. The PDF watermark can be used to create the exact effect produced by the old-style watermarking, but it also has many other uses. For a PDF, the term watermark means over- or under- laying text and/or images onto a page. Since water has a very different effect on electronic equipment, a watermark on a PDF is quite different. A watermark on an old-style DTF (dead-tree-format) was literally just that, a shadowy mark on the page created by applying water to the document.
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