Watermark your PDF in seconds.
Stamp any text across every page — confidential, draft, your name, your brand. Runs entirely in your browser, nothing uploaded.
What is a PDF watermark?
A PDF watermark is text or an image stamped across the pages of a document, typically in a semi-transparent or diagonal style. Watermarks serve several purposes: they mark a document as confidential, draft, or proprietary; they identify the intended recipient of a distributed copy; they assert ownership or authorship of a document before it is shared publicly; and they signal the status of a document in a review workflow (such as "For internal use only" or "Not for distribution").
Text watermarks are the most common type. A word or short phrase is rotated and centered on each page, with enough opacity to be clearly visible but not to obscure the underlying content.
How the watermark is applied
Foliopress stamps the watermark on top of the page content using pdf-lib's text rendering. The text is centered on each page, rotated 45 degrees by default (or at your chosen angle), and rendered at the opacity and font size you select. The original page content — text, images, annotations, form fields — is preserved underneath. The watermark text is drawn as a PDF text layer, which means it scales properly at all zoom levels and print resolutions.
The resulting PDF is a standard document that opens in any PDF viewer. The watermark is not a separate layer that can be trivially removed in Acrobat — it is rendered as part of the page content.
Privacy
Your PDF stays entirely in your browser. The watermarking process uses pdf-lib running locally in your tab. No file or text is sent to any server. The watermarked PDF is generated in memory and downloaded directly to your disk.