How to use Add Watermark to PDF
- Choose a PDF file.
- Enter watermark text and an opacity value between 0.05 and 1.
- Select Add Watermark.
- Download watermarked.pdf and verify readability on light and dark pages.
🔒 Local browser processing
Add Watermark to PDF
Mark drafts, internal documents or review copies with a visible text watermark. No registration is required.
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What the tool creates
The tool embeds a bold standard font and draws the chosen text diagonally across the center of every page. Opacity can be set from 0.05 to 1.
The result is watermarked.pdf. The watermark becomes part of each page's content stream in the new file.
Common uses
- Labeling confidential review copies
- Marking drafts before approval
- Adding a department or status label
Important limits
- The same watermark text, angle and style are applied to every page.
- Very long text can extend beyond page boundaries.
- A watermark is a visual notice, not access control or encryption.
Privacy note: Supported processing runs in this browser tab. Do not process files you are not authorized to handle, and keep an original backup.
Add Watermark to PDF questions
Can I change watermark opacity?
Yes. Lower values are lighter; higher values are more prominent.
Can I add an image watermark?
The current version supports text watermarks only.
Can I watermark selected pages?
The current version applies the watermark to every page.
Does a watermark secure the PDF?
No. It labels the document but does not prevent copying, editing or opening.
Will the watermark be removable?
Advanced PDF editors may alter page content, so do not treat a watermark as tamper-proof.
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