How to add a confidential watermark to a pdf document
- Step 1Upload the PDF — Drop the document to be watermarked into the tool.
- Step 2Enter CONFIDENTIAL as the watermark text — Type the watermark text and choose colour, opacity (e.g., 20-30%), and font size.
- Step 3Apply to all pages — Stamp the watermark on every page of the document.
- Step 4Download and distribute — Save the watermarked PDF and share it with internal recipients.
Frequently asked questions
Can recipients remove the watermark?+
A stamped text watermark is part of the page content. While technically removable with advanced PDF editing tools, it is a strong deterrent for standard users.
What opacity level works best for a CONFIDENTIAL watermark?+
15-25% opacity is the standard range — visible enough to be noticed but transparent enough not to obstruct reading.
Can I use my company's branding colours for the watermark?+
Yes — enter any hex colour code or choose from the colour picker to match your brand palette.
Privacy first
All PDF processing runs locally in your browser using PDF-lib and pdf.js. No file is ever uploaded — only metadata counters are saved for signed-in dashboard stats.