Watermark PDF
Stamp custom text or confidential status watermarks across your PDF pages with adjustable opacity.
Select PDF to Watermark
Stamp custom text watermarks onto any PDF document. Processed locally in your browser.
How to Use Watermark PDF
Upload PDF
Select the file to watermark.
Design Stamp
Type watermark text, choose position, rotation, and opacity.
Stamp & Save
Download your watermarked document.
Key Capabilities
Local Execution
Renders watermark vectors onto the page graphics state directly in client browser memory using pdf-lib operators, ensuring the stamp integrates with the page content.
- •Use 20% to 30% opacity so text underneath remains comfortably readable.
- •Avoid pure black text at 100% opacity, which may obscure critical underlying information.
Alpha-Blended Graphic State Stamping Architecture
Alpha Transparency Controls
Configure text transparency from 10% to 100% via PDF /ExtGState opacity dictionaries, ensuring underlying document text remains legible beneath status stamps.
Rotational Geometry
Apply diagonal -45° stamps (standard for "CONFIDENTIAL", "DRAFT", or "DO NOT COPY") or horizontal watermarks with customizable font sizes and colors.
Tiled vs Center Stamping
Choose between single centered watermark stamps or continuous repeating tiled patterns across the entire page canvas to deter unauthorized redistribution.
- •Watermarks are injected as vector text states without rasterizing the underlying pages.
- •Underlying document text remains fully searchable and selectable.
- •Complete local processing ensures sensitive drafts are never uploaded.
Frequently Asked Questions
Can the watermark be easily removed?↓
The watermark becomes part of the PDF content stream, making casual removal difficult.
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Related Guides
How to Watermark a PDF with Text or Stamps
Brand your documents or declare status (CONFIDENTIAL, DRAFT) with customizable opacity and rotation.
How to Password Protect and Encrypt a PDF with AES-256
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