Add a Watermark to a PDF

Stamp CONFIDENTIAL, DRAFT, your company name or any text across a PDF, choose the position — diagonal, centre, top, bottom or tiled — and set the opacity. The watermark auto-sizes to fit the page, and nothing is uploaded.

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Watermark PDF

Stamp CONFIDENTIAL, DRAFT or any text diagonally across every page.

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Drop a PDF here or click to browse

Watermark text Position Visibility 25%

Mark Documents the Way You Want

A watermark signals status and ownership at a glance — that a document is a draft, confidential, a sample, or property of your company. Unlike many free tools that only stamp a fixed diagonal mark, this one lets you choose where the text sits and how strong it appears, so it reinforces the message without obscuring the content underneath.

The text is sized automatically to fit each page, whatever the page dimensions, and applied to every page in one pass. Pick a light opacity for a subtle background mark, or a stronger one for an unmissable DRAFT stamp.

Applied Privately in Your Browser

The watermark is drawn into the PDF by pdf-lib running on your device. The document is never uploaded, so confidential files you most want to mark also stay private.