A watermark identifies a document at a glance: “CONFIDENTIAL”, “DRAFT”, “COPY”, or your company name in subtle gray across every page. It makes it immediately clear who created the document and how it should be treated – and it makes unintended redistribution harder.

What watermarks are for

Watermarks are more than decoration. Typical use cases:

  • Marking confidentiality: “CONFIDENTIAL” or “INTERNAL” tells the recipient how to handle the document.
  • Showing status: “DRAFT” prevents misunderstandings when a document isn’t final yet.
  • Tracing distribution: A watermark with the recipient’s name reveals where a document came from if it ends up online.
  • Branding: Your company name or logo in the background reinforces the brand with every export.

Choosing opacity, position and size well

A good watermark informs rather than interferes. Three settings make the difference:

  • Opacity: At 10 to 25 percent, the content stays perfectly readable while the watermark remains clearly visible. For urgent notices like “CONFIDENTIAL”, a higher opacity is fine.
  • Position: A diagonal layout across the whole page is the most visible and hardest to remove. A corner or a centered stamp works too.
  • Size: Large enough not to be missed, small enough not to cover the text.

With the PDF Watermark tool you set the text, opacity and size – the distribution across pages happens automatically and stays local in your browser.

How to add a watermark

  1. Select a file: Drag and drop your PDF into the tool or pick it from the file dialog.
  2. Set text and style: Type the text you want, e.g. “CONFIDENTIAL”, and adjust opacity and size.
  3. Download: Save the watermarked file to your device.

The process takes only a few seconds – on desktop and mobile alike.

Privacy: processing in your browser

As with all our tools, your file is not uploaded. The watermark is stamped onto every page directly on your device. That matters especially for documents you don’t want to publish yet – a draft or a confidential proposal shouldn’t pass through a server.

Combining with other tools

A watermark is often part of a bigger document strategy:

  • Protection: Combine the watermark with password protection for highly sensitive files.
  • Preparation: Merge several documents first with the Merge PDF tool, then stamp the result with a watermark. Our guide Why and how to merge PDFs explains the first step in detail.

Frequently asked questions

What text can I use as a watermark?

Anything you like: “CONFIDENTIAL”, “DRAFT”, “COPY”, your company name, or the recipient’s name.

Does the watermark cover my content?

No. The watermark is laid semi-transparently across the pages diagonally, so the content stays readable. You control the opacity.

Can I remove the watermark later?

An added text watermark becomes part of the page and cannot be easily removed. Keep a copy of the original if needed.

Is my file uploaded?

No. The watermark is applied entirely locally in your browser. Your file never leaves your device.

Is the tool free?

Yes. Adding watermarks is free forever and requires no registration.

Does it work on mobile?

Yes. Because processing runs in the browser, it works on desktop and mobile alike.

Wrap-up

A watermark makes documents instantly recognizable and discourages unwanted redistribution. With the PDF Watermark tool you can stamp it in seconds – locally in the browser, with no upload. For highly sensitive files, combine the watermark with password protection.