Add Watermark to PDF

How to Add a Watermark to a PDF

1. Drag your PDF onto the drop zone, or click to browse for it.
2. Type your watermark text — like CONFIDENTIAL, DRAFT, or your name.
3. Choose orientation, position (centre or tiled), colour, font size and opacity, and watch the live preview update.
4. Click Add Watermark & Download to stamp every page and save the new PDF.

Why use ZillaKit's PDF watermark tool?

The watermark is drawn directly into your PDF in the browser using the pdf-lib library, while pdf.js renders the live page-one preview — no server ever sees your document. That keeps contracts, drafts, proposals, and confidential reports entirely on your device. You control everything: diagonal or horizontal text, a single centred mark or a tiled pattern that repeats across the whole page, three clear colours, adjustable font size, and an opacity slider so the watermark sits behind your content without hiding it. There's no signup, no forced branding, and no page-count paywall for everyday use. Because there's no upload round-trip, watermarking stays fast even for long documents and keeps working offline once the page has loaded. Five free watermark jobs are included every day, with more available in seconds.

FAQ

Is my PDF uploaded to add the watermark?

No. Both the preview and the final watermarking happen locally in your browser. Your file never leaves your device and nothing is sent to a server.

Does the watermark go on every page?

Yes. The text you choose is stamped onto all pages of the document. The preview shows page one as a close approximation of the result.

Can I make the watermark faint so it doesn't hide my text?

Yes. Use the opacity slider to make the watermark as subtle or as bold as you like, from a light 5% tint up to a solid 100%.

What's the difference between centre and tiled?

Centre places one watermark in the middle of each page. Tiled repeats the text in a grid across the whole page, which is harder to crop out.