Add a watermark to a PDF
Overlay a diagonal text watermark on every page — control the text, opacity, angle, and size. Runs entirely in your browser.
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What a watermark does
It draws your text — CONFIDENTIAL, DRAFT, a name, anything — across each page at an angle and opacity you set. It signals status or ownership without obscuring the document underneath.
Tuning the look
Lower the opacity so content stays readable through the mark, adjust the angle for a classic diagonal, and size the text to span the page. Sensible defaults give you a translucent 45-degree stamp out of the box.
Quality & fidelity notes
The watermark is real, selectable text drawn on top of your existing pages, which remain fully intact beneath it. Because it's vector text, it stays sharp at any zoom level.
How to watermark pdf
- Drop your PDF into the zone above.
- Type your watermark text and adjust opacity, angle, and size.
- Press Add watermark — it runs locally in your browser.
- Download the watermarked PDF.