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Add Watermark to PDF

Stamp your PDF with a text watermark like “CONFIDENTIAL” or “DRAFT” – fully customizable in text, opacity and orientation, right in your browser.

Updated: August 2026

  • 100% browser-based Your files never leave your device.
  • No registration Start instantly – no account, no login.
  • Privacy first No upload, no storage on servers.

Process PDF

Select a PDF and enter your watermark text.

Key features

  • Custom text Any watermark text, e.g. CONFIDENTIAL.
  • Adjustable opacity & size From subtle to clearly visible.
  • Every page is marked Placed automatically on all pages.
  • 100% local processing No file ever leaves your browser.
  • Free, no sign-up Free forever, no registration.
  • → Deter unauthorized sharing: Mark documents as confidential.
  • → Label versions: Draft, copy or release instantly recognizable.
  • → Private and secure: Confidential content never leaves your device.

Notes & limitations

  • • Watermarks cannot be removed: It becomes part of the page – keep the original.
  • • Password-protected files: Protected PDFs must first be opened with Unlock PDF.

How it works

Three steps to a finished PDF – no sign-up.

  1. 01

    Choose a file

    Drag & drop your PDF into the field or pick it from your device.

  2. 02

    Run the tool

    Adjust options and click Process – everything runs locally in your browser.

  3. 03

    Download

    Save the finished PDF straight to your device.

How do I add a watermark?

Our free tool stamps a semi-transparent text watermark diagonally across every page of your PDF – entirely in your browser. Type the text you want and adjust opacity and size as you like. Typical examples are “CONFIDENTIAL”, “DRAFT”, “COPY” or your company name.

When is a watermark useful?

Watermarks protect documents from unauthorized reuse. Confidential contracts are marked “CONFIDENTIAL”, quotes are labeled “DRAFT”, and documents shared with third parties often carry “COPY”. This makes the version and ownership visible at a glance.

Does the watermark cover the content?

No. The watermark is semi-transparent by default and laid diagonally across the pages. The text and images of your document stay fully readable. Adjust the opacity from subtle to clearly visible as needed.

Is adding a watermark safe?

Yes. Because processing happens only in your browser, your file never leaves your device. We store no content on our servers.

Is this tool free?

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

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Frequently asked questions

Is this tool really free?
Yes. Adding watermarks to PDF files is completely free and requires no registration.
Are my files uploaded?
No. All files are processed exclusively in your browser. Nothing is uploaded to our servers.
What text can I use as a watermark?
Any text works, e.g. “CONFIDENTIAL”, “DRAFT”, “COPY” or your company 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.
Which texts work well as a watermark?
e.g. CONFIDENTIAL, DRAFT, COPY or your company name.
Can I adjust opacity and size?
Yes. Opacity and font size are freely adjustable.
Is the watermark placed on every page?
Yes. Every page of the document is marked automatically.
Does it work on mobile?
Yes. Because everything runs in the browser, it works on every device.