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PDF Watermark Online

Add custom text watermarks across every page of your PDF.

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Select or Drop PDF Watermark File

Files are processed 100% locally in your web browser. Zero server uploads.

What is the PDF Watermark?

Protect your intellectual property by embedding custom watermark text (e.g. CONFIDENTIAL, DRAFT) across PDF pages.

Why Use This Tool: Protecting intellectual property, drafts, or confidential contracts against unauthorized distribution.

Designed For: Students, educators, legal professionals, and office administrators managing PDF documents.

Key Features of PDF Watermark

✓Custom text watermarks with font size and color picker
✓Adjustable diagonal angle and opacity transparency
✓Select page ranges for watermark application
✓Zero server storage guarantees confidentiality

How to Use the PDF Watermark Online

  1. Select your PDF file.
  2. Type your watermark text (e.g. CONFIDENTIAL, DO NOT COPY).
  3. Adjust opacity and angle if desired.
  4. Click Watermark PDF and download the stamped document.

Privacy & Technical Specifications

100% Client-side vector stamping.

Output Format: .pdf

Processing Engine: 100% Client-Side (In-Browser)

Maximum File Size: 100 MB

Server Storage: None (Zero file upload, processed in local memory)

Frequently Asked Questions about PDF Watermark

How do I use the PDF Watermark online?

Simply drag and drop or upload your PDF file(s) into the tool area above, configure your desired options, and download your processed document instantly.

Are my files or data uploaded to a remote server?

No. Toolketly operates 100% client-side in your web browser using modern WebAssembly, JavaScript, and HTML5 Canvas engines. Your private documents, images, and data never leave your computer or phone.

Is the PDF Watermark completely free to use?

Yes, this tool is 100% free with no registration, no email signup, no subscriptions, and no hidden watermarks added to your files.

What file formats and sizes are supported?

This tool supports .pdf input files and exports in .pdf format. Processing runs locally in your device memory up to 100 MB.

Can I use this PDF Watermark on mobile devices?

Yes! Toolketly is fully responsive and functions seamlessly across all modern browsers on iOS, Android, macOS, Windows, and Linux without requiring any app or software installation.

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