PDF Watermark Adder
Stamp a diagonal text watermark like "CONFIDENTIAL" or "DRAFT" across every page of your PDF. Processing happens entirely in your browser.
How to Use the PDF Watermark Adder
- Choose a PDF file from your device.
- Type the watermark text you want, e.g. "CONFIDENTIAL", "DRAFT" or your company name.
- Adjust font size and opacity to taste with the sliders.
- Click "Add Watermark" — the stamped PDF downloads automatically.
Why Use This Tool?
Is my document uploaded anywhere?
No. The watermark is drawn directly onto each page inside your browser using the PDF-lib library. Your file never leaves your device, which is especially useful when marking sensitive drafts or confidential contracts.
Where is the watermark placed?
The text is centered diagonally across each page at a 45-degree angle, a common style used for draft stamps and confidentiality notices, so it's visible without completely obscuring the underlying content.
Can I control how visible the watermark is?
Yes, use the opacity slider to make the watermark subtle (low opacity) or bold and obvious (high opacity), and the font size slider to scale it to your page size.
Does the watermark apply to every page?
Yes, the same watermark text, size and opacity are applied consistently across every page in the document in a single pass.