PDF Watermark

Add a text watermark to a PDF — diagonal, centered, or tiled — with custom color, size, and opacity, right in your browser.

Choose one PDF. We read it locally to count its pages.

Watermark layout
Which pages?

ToolsSoup's PDF Watermark is a free online tool that stamps a text watermark onto every page of a PDF — or just a chosen range — entirely in your browser. Choose a diagonal, centered, or tiled layout, pick any color, size, and opacity, then download the marked file in one click. No uploads, no sign-up, and nothing ever leaves your device.

What is a PDF watermark?

A PDF watermark is text laid over the pages of a document to label it — for example CONFIDENTIAL, DRAFT, or your company name — so readers know its status or origin at a glance. Watermarks deter casual copying, mark proofs and review copies, and protect intellectual property without changing the underlying content. ToolsSoup writes the watermark text directly into each page using the open-source pdf-lib engine, with adjustable opacity so the original text underneath stays readable. Because everything runs locally, your file is never sent to a server.

How to add a watermark to a PDF online

Watermarking a PDF with ToolsSoup takes just a few seconds:

  1. Click Select a PDF file and choose the document you want to watermark.
  2. Type your watermark text and pick a layout — diagonal, centered, or tiled.
  3. Adjust the color, font size, and opacity, choose all pages or a range, then click Add watermark and download the result.

Why use this PDF watermark tool?

  • 100% free with no ads, sign-up, watermarks of our own, or page limits.
  • Runs entirely in your browser — your PDF is never uploaded to a server.
  • Diagonal, centered, or repeated tiled layouts to suit any document.
  • Full control over the watermark color, font size, and transparency.
  • Apply the watermark to every page or only a chosen page range.

Frequently asked questions

Is this PDF watermark tool free?

Yes. Every tool on ToolsSoup is completely free, with no account, sign-up, watermarks, or hidden limits.

Is my PDF uploaded anywhere?

No. The entire watermarking process happens locally in your browser using JavaScript, so your document is never sent to or stored on any server.

Can I make the watermark see-through?

Yes. Use the opacity slider to set how transparent the watermark is. A lower opacity lets the text underneath stay easy to read, while a higher opacity makes the watermark stand out more.

Can I watermark only some pages?

Yes. Choose the page-range option and set the From and To page numbers to watermark just those pages, leaving the rest of the document untouched.

Can the watermark be removed later?

The watermark text is drawn into the pages as real content, so it is not a temporary on-screen overlay. Keep your original file if you may need an unmarked copy, since the downloaded PDF includes the watermark permanently.