Dynamic watermark

What makes a watermark dynamic

A fixed watermark is the same on every copy: every reader sees the same word or the same logo. A dynamic watermark is different on each copy. The most common form stamps the recipient's name, their email address, or a unique reference number onto the document when it is issued, so two copies of the same file are not identical.

The purpose is traceability. If a marked copy turns up somewhere it should not, the unique text points back to the copy it came from.

How it compares with a fixed watermark

A fixed watermark is simpler, and it is what most people mean when they say “watermark”: one status or owner shown to every reader. A dynamic watermark adds accountability on top of that signal, because each recipient knows their own copy is identifiable. Dynamic watermarks are normally produced by document rights or personalisation systems that know who each recipient is, rather than by a one-off stamping tool.

What WalkingPDF does

WalkingPDF applies a fixed watermark: one text, the same on every page of the file you upload. That covers the usual needs, such as CONFIDENTIAL, DRAFT, a logo or a footer with your details. It does not generate a different watermark for each recipient and it does not track who received which copy.

You can, of course, run the tool once per file to give different documents different marks. That is still a fixed watermark per file, not dynamic per-recipient text. If you need a name or reference stamped automatically on each copy at issue time, you would do that inside a system that already knows the recipients, which is a different kind of product from a PDF watermarking tool.