Watermark PDF
Stamp a diagonal text watermark — CONFIDENTIAL, DRAFT, or your own text — across every page. Adjustable size, opacity, and colour. All in your browser.
Watermark PDF Tool
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Mark Every Page — CONFIDENTIAL, DRAFT, or Your Own Text
A watermark tells everyone how a document should be treated before they read a word of it. This tool draws your text diagonally across every page at the size, colour, and opacity you choose — ideal for marking contracts CONFIDENTIAL, labelling revisions DRAFT, or adding your name to work you share.
The watermark is drawn as real PDF text on top of each page, so the original content is untouched underneath. Everything runs on your device via open-source browser libraries — your file is never uploaded. You can verify it yourself.
Frequently Asked Questions
Yes — type anything up to 40 characters (a name, a status like DRAFT, a company name). It is stamped diagonally across every page.
The watermark is semi-transparent (you control the opacity), so the underlying text stays readable. Lower the opacity for a subtle mark.
It is drawn into the downloaded copy. Your original file is never changed. For a truly tamper-resistant mark, flatten or protect the file afterwards.
No. The watermark is applied locally with pdf-lib; your document never leaves your device.