PDF Watermarker

Instantly stamp custom text across every page of your PDF document. Processing happens 100% locally in your browser for absolute privacy.

🖋️
Drag & Drop a PDF here

or click to browse from your computer

About The PDF Watermarker

Protecting your intellectual property and marking documents as 'CONFIDENTIAL' or 'DRAFT' is critical in business. However, using online watermark tools often requires you to upload your proprietary, unreleased documents to a third-party server, creating a massive security vulnerability.

Our PDF Watermarker solves this by executing entirely within your browser using the local pdf-lib engine. You can instantly stamp fully customizable text across every single page of your document without a single byte of data ever leaving your computer.

How to Use

  1. Upload a PDF document by dragging and dropping it into the workspace.
  2. Type your desired watermark text (e.g., 'CONFIDENTIAL', 'DRAFT', 'DO NOT COPY') into the input field.
  3. Use the intuitive sliders to adjust the Font Size and Opacity. We recommend an opacity between 20% and 40% so the text doesn't obscure the underlying document.
  4. Select a Rotation angle (Horizontal, Diagonal, or Vertical) and pick a Color using the color picker.
  5. Click 'Apply Watermark & Download'. The engine will instantly stamp every page and save the new secure document to your hard drive.

Frequently Asked Questions

Is the watermark permanent?

Yes. Once the PDF is processed and downloaded, the text is cryptographically embedded and flattened into the PDF byte stream. It cannot be easily removed by standard PDF readers.

Can I watermark hundreds of pages at once?

Absolutely! The local engine uses an optimized looping algorithm that can stamp a 500-page document in mere milliseconds.

Is my proprietary document safe?

Yes. Because the stamping process happens locally in your device's RAM, your document is never transmitted to our servers, ensuring 100% data privacy.