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How to Add a Watermark to a PDF

A watermark marks a document as draft, owned, or shared — without getting in the way of the content. Here's how to place one sensibly.

4 min readSep 13, 2026GainUtility

The point of a watermark is to be noticed without being disruptive: this is a draft, this belongs to a client, this was shared on a certain date. A watermark that blocks the text underneath has failed at the one job it has.

Text or image watermark

Text watermarks cover the common cases — “DRAFT”, “CONFIDENTIAL”, a date, your name. Image watermarks matter when the look is the point: a logo across a sales deck, a signature over a scan. Both apply the same way: fixed to every page, positioned once.

Placement and opacity

Two settings decide whether a watermark looks intentional or like a mistake. A diagonal center watermark at moderate-to-low opacity can't be cropped away with a quick screenshot and still leaves content readable. Edge placement is subtler but easier to crop off in a screen grab — choose based on how protective you need to be.

Step by step

The whole job, in order:

  1. Open the GainUtility PDF watermark tool and upload the document.
  2. Add the text (or your image) and set the size and rotation.
  3. Pick placement — diagonal center is the sensible default for drafts.
  4. Set opacity low enough that a page of text still reads clearly underneath.
  5. Export and open one text-heavy page to confirm it's legible.