How to Stamp Watermarks on PDF Documents Online Free
Distributing preliminary drafts, proprietary pitch decks, legal filings, or financial projections often requires watermarks like "CONFIDENTIAL" or "DRAFT" to prevent leaks and copyright infringement. EasyToolz lets you stamp watermarks across all pages in seconds without third-party cloud uploads.
- Select your PDF: Drag and drop your document into the workspace above or browse files on your device.
- Enter watermark text: Type your desired message, adjust font size, pick a color (Gray, Red, Blue, Green), and configure transparency/opacity.
- Choose placement: Select Center Diagonal, Repeated Tile, or Bottom Center.
- Download secured PDF: Click "Add Watermark & Download PDF" to instantly save your branded document.
Why Watermark PDFs with EasyToolz?
- 100% Private Client-Side Stamping: Proprietary client presentations and legal records never travel across the internet.
- Crisp Vector Font Rendering: Stamped text uses native PDF font vectors so watermarks look sharp at any zoom level or in print.
- Zero Subscription Cost: No hidden subscriptions, no page counts limits, and no EasyToolz branding stamped into your output.
Explore more PDF document tools: PDF Merger, Sign PDF, Compress PDF, Add Page Numbers.
Frequently Asked Questions
Can I add a diagonal watermark across the center of all PDF pages?
Yes! The default "Center (Diagonal -35°)" setting automatically positions a rotated, semi-transparent watermark across the middle of every page.
Are my sensitive documents uploaded to any server?
Never. All watermark stamping is computed directly in your browser's local memory using PDF-lib. Your confidential documents never leave your computer or phone.
Can I adjust the transparency so the underlying document text is readable?
Yes. Use the Opacity slider (default 22%) to ensure text underneath remains completely legible.
What watermark text can I use?
You can enter any custom phrase, including CONFIDENTIAL, DRAFT, SAMPLE, DO NOT COPY, or your brand name.