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Add watermark Online

Overlay custom watermark text or image to secure or brand your documents. No registration, no watermarks, and zero file uploads required. All conversions and modifications operate completely secure and private inside your client-side browser.

Benefits & Features

  • 100% Secure Client-Side Engine: Your private document files remain on your device and are never transmitted to any external server.
  • Speed & Efficiency: Zero network bandwidth lag. Experience instant results parsed directly in browser RAM buffers.
  • Completely Free of Charge: No subscription traps, sign-ups, payment screens, or locked premium limits.

How to Use Add watermark

  1. Select your document.
  2. Type your custom text or upload a transparent PNG image.
  3. Set the angle, opacity, font size, and layout positions.
  4. Click "Add Watermark" and download the secure file.

Technical Details

PDF Watermarking overlays custom text arrays or graphic objects directly onto page streams. The engine calculates canvas coordinate transparency vectors and embeds these objects as secondary layers.

Watermark TypesCustom Text & Digital Images
Opacity SettingsFully adjustable alpha transparency

Frequently Asked Questions (FAQ)

Q: Can the watermark be removed easily?

A: Our engine embeds watermarks directly into the content stream layers, making them highly permanent and tamper-resistant.

Q: What types of watermarks can I add?

A: You can overlay custom text with variable fonts or upload transparent PNG/JPG images to serve as watermarks.

Q: Can I adjust the transparency and angle of the watermark?

A: Yes, our tool provides simple sliders to customize the angle (e.g., diagonal) and alpha opacity levels.

Q: Does the watermark apply to all pages automatically?

A: Yes, by default it applies to all pages, but you can configure it to skip specific pages (such as the cover page) if needed.

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