PDF Watermark

Stamp a text watermark across every page of a PDF, set the words, color, opacity, size and angle, then download the marked file. Stamped in your browser; nothing is ever uploaded.

Set your text and style, then drop in a PDF. The watermark is stamped across the center of every page and the result downloads automatically.

How it works

Your text is drawn over the center of each page at the angle and opacity you choose, using the pdf-lib engine and a built-in Helvetica-Bold font. The original content stays intact underneath.

Your PDF is watermarked entirely in your browser, nothing is ever uploaded.

What this does

A PDF watermark tool stamps text across every page — you set the words, color, opacity, size, and angle.

How to use it

  1. Open your PDF.
  2. Type the watermark text.
  3. Set color, opacity, size, and angle.
  4. Download the marked file.

Understanding your result

The mark is stamped permanently into every page and cannot be cleanly removed, so always keep an unmarked master copy. A semi-transparent text watermark signals ownership or status and deters casual reuse, but it is a visual deterrent, not security, anyone can still read or copy the text underneath, so use the password tool if you need to actually restrict access.

Example

A diagonal “CONFIDENTIAL” sits over every page.

Last updated .

Frequently asked questions

What can I control about the watermark?

The text itself plus its color, opacity, font size and angle (diagonal, horizontal or vertical). It is centered on every page.

Does the watermark cover up my content?

It is drawn semi-transparently over the center of each page, so your original content stays readable underneath. Lower the opacity for a subtler mark.

Can the watermark be removed later?

It is drawn into the page content rather than as a separate layer, so it is not a simple toggle to remove, keep your original file if you need an unmarked copy.

Is my PDF uploaded?

No. Everything is calculated locally in your browser.