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Client-side · No uploads · 100% Private

Add Watermark

Stamp custom text on any position, rotation, and page range — all inside your browser.

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CONFIDENTIAL

Approximate preview — actual result may vary per page size

ℹ️ How it works

  • Uses pdf-lib to stamp Helvetica Bold text at the chosen position and rotation on every matching page.
  • Font size automatically scales with the page dimensions.
  • Odd / Even page filtering lets you target specific pages for double-sided layouts.
  • Password-protected PDFs cannot be processed — use the Unlock PDF tool first.

All processing happens entirely inside your browser. Your files never leave your device.

What is the Add Watermark to PDF tool?

The Add Watermark tool lets you place custom text across the pages of your PDF document. There is often a strong need to protect intellectual property or clearly mark files as "Confidential" or "Draft" before sharing them with clients.

By stamping your document with a visible watermark, you ensure your work is recognized and secure. This simple addition helps prevent unauthorized sharing and makes the document status instantly clear to anyone viewing it.

How to Add Watermark to PDF for Free (Step-by-Step)

Let us secure your document with a text watermark:

  1. Import your file: Drag the PDF you want to protect into the main upload box.
  2. Type your custom text: Enter the word or phrase you want to stamp, such as "CONFIDENTIAL" or your brand name.
  3. Customize the look: Adjust the text size, color, and transparency until it looks good on your document without distracting the reader.
  4. Apply and download: Press the button to add the watermark. You can now download the protected PDF immediately.

Why Processing Locally is Safer for Your Files

When dealing with highly classified or drafted business documents, the last thing you want is to upload them to unknown clouds. PDFSetu is built to be 100% private, processing your files locally directly in your web browser (Client-Side).

In simple terms, no server uploads, no data retention, and zero risk to your business secrets. Because the heavy lifting is handled right on your device, the process is lighting fast and entirely free for everyone.

Frequently Asked Questions (FAQs)

  • Will my business documents be stored on your servers?
    Never. Your business files are handled locally on your own computer. They never upload to our servers, keeping them completely private.
  • Can I choose the color and size of the watermark?
    Yes, our tool gives you full control. You can pick the right color, adjust the opacity so it is slightly see-through, and resize the text.
  • Is adding a watermark free?
    Yes, the Add Watermark tool is totally clear of paywalls and fully free to use.