Add Watermark to PDF

Brand or protect every page

Type your watermark text — like DRAFT or CONFIDENTIAL — and it's drawn diagonally and centered on every page using pdf-lib. Adjust size, opacity, angle and color to get exactly the look you want.

Because the watermark is applied in your browser, the original PDF is never uploaded.

Common uses

• Marking documents as draft or confidential
• Adding ownership or copyright text
• Branding shared PDFs

Key features at a glance

• Stamp a diagonal text watermark across every page
• Adjustable size, opacity, angle, and color
• Centered on each page automatically
• Applied with pdf-lib — your file is never uploaded
• Keeps the underlying text and content intact
• Works offline once the page has loaded

Why watermark a PDF

A watermark on a PDF communicates status and ownership at a glance. Stamping DRAFT across a document tells readers it is not final; CONFIDENTIAL warns that it should not be circulated; a company name or copyright notice asserts ownership. Because the mark appears on every page, the message travels with the document no matter which page someone is looking at or prints.

Watermarks also discourage unauthorized use and misrepresentation. A visibly marked draft cannot easily be passed off as a finished, approved version, and a confidential stamp makes any leak obviously deliberate. For documents shared before they are final, or sent to parties who should treat them as restricted, a clear watermark sets expectations that plain text in the corner cannot.

Designing an effective PDF watermark

The settings let you balance visibility against readability. A diagonal watermark across the center of the page is the hardest to ignore or crop away, which is why it is the classic choice for DRAFT and CONFIDENTIAL stamps. The angle and large size make the mark span the page, while the opacity controls how much it competes with the content beneath.

Opacity is the key dial: too solid and the watermark obscures the text, too faint and it fails to register. A semi-transparent mark — clearly visible but still letting the document be read — is usually right. Color matters too, with a light gray or muted red being common for an unobtrusive but unmistakable stamp. Tuning these gives you a watermark that does its job without ruining the document.

Why local watermarking protects your documents

The documents you most want to watermark — drafts, confidential reports, proprietary material — are exactly the ones you should not upload to an unknown server. An online watermarking service that processes your file remotely sends that sensitive document off your device, undermining the very confidentiality the watermark is meant to assert.

This tool applies the watermark in your browser with pdf-lib, so the original PDF never leaves your machine. That keeps confidential documents private throughout, lets the tool work offline, and makes watermarking instant with no upload. The watermark is drawn over the existing pages without re-rendering them, so the underlying text stays intact while the mark is added on top.

Tips for watermarking PDFs

• Use a diagonal, centered mark so it cannot be cropped away
• Keep opacity semi-transparent so the document stays readable
• Use DRAFT or CONFIDENTIAL to set clear expectations
• Choose a muted color like gray or red for an unobtrusive stamp
• Watermark before sharing drafts so they are not mistaken for final

Why choose our PDF watermark tool?

Our tool is completely free with no signup, no limits, and no subscription. The watermark is applied locally in your browser with pdf-lib, so your original PDF is never uploaded, the content stays intact, and the tool works offline.

It is one of more than 200 free tools on ToopTools, and you can pin it to your My Workspace, a personalized workspace where you keep the tools you use most in a single dashboard. Beside the merger, splitter, and other PDF tools, it helps you brand and protect documents privately.

Common use cases

People use the PDF watermark tool to mark documents as draft or confidential, to add ownership or copyright text, and to brand PDFs they share. The watermark sets the right expectations on every page.

Businesses stamp proposals and reports before circulating them, freelancers mark proofs sent to clients, and legal and academic users label drafts. Because the watermark is applied locally, even sensitive documents are protected without being uploaded.

Is the PDF watermark tool free?

Yes. It is completely free with no account, no sign-up, and no usage limits. Watermark as many PDFs as you like at no cost.

Does the watermark appear on every page?

Yes. The text is stamped diagonally and centered on every page of the document, so the mark is present no matter which page is viewed or printed.

Can I adjust how visible the watermark is?

Yes. You can adjust the size, opacity, angle, and color, so you can make the watermark a subtle semi-transparent mark or a bold, prominent stamp depending on your needs.

Will the watermark cover up the text?

Only as much as you choose. With a semi-transparent opacity, the watermark is clearly visible while the document underneath remains readable, since the mark is drawn over the existing content rather than replacing it.

Is my document uploaded to a server?

No. The watermark is applied entirely in your browser with pdf-lib, so your file never leaves your device. The tool is private and works without an internet connection.

Can the watermark be removed afterward?

The watermark is drawn into the page content of the downloaded file, so it is not a simple toggle to remove. Keep your unwatermarked original if you will need a clean version later.

Does the watermark print on paper too?

Yes. Because the watermark is part of the page content rather than a screen-only overlay, it appears both on screen and when the PDF is printed, so a DRAFT or CONFIDENTIAL stamp carries through to hard copies as well.

How do I add a watermark to a PDF?

Upload your PDF, type your watermark text, and adjust its size, angle, and opacity in the preview. The tool stamps it across every page, then lets you download the watermarked document — useful for marking drafts or confidential files.

Does the PDF watermark tool work offline?

Yes. The watermark is applied entirely in your browser, so once the page has loaded the tool works without an internet connection, and your document is never uploaded — it stays private on your own device.