Adding a watermark to a PDF is one of the most effective ways to protect your documents, mark them as drafts, or label them as confidential. Whether you are sharing contracts with clients, circulating internal reports, or distributing proofs that should not be redistributed, a visible text watermark clearly communicates the status and ownership of the document. This free watermark pdf tool lets you stamp any text across every page of your file in just a few clicks.
Our watermark pdf tool processes everything directly in your browser using client-side JavaScript and the pdf-lib library. Your documents are never uploaded to a server, which means your sensitive files stay on your device at all times. You can customize the watermark text, font size, opacity, color, and positioning to get exactly the look you need. Choose a subtle diagonal watermark for drafts or a bold centered stamp for confidential documents. There are no file-size limits beyond what your browser can handle, no daily usage caps, no accounts to create, and no watermarks added by the tool itself — only the watermark text you choose will appear on your pages.