Add a watermark to a PDF

Adding a watermark to a PDF is usually about marking a document's status: DRAFT for a copy that isn't final, CONFIDENTIAL for one that shouldn't circulate, your company name on a sample, or the recipient's name on a personalized export. Our watermark tool stamps the text you choose on every page of the PDF, with the angle and opacity you pick, so the marking reads at a glance without obscuring the underlying content.

Angle options cover the three common watermark layouts: 0° for a horizontal stamp (good for headers or footers-style markings), 45° for the classic diagonal across the page (the standard "DRAFT" look), and 90° for a vertical stamp along the side. Opacity ranges from a barely-there 5% — useful when you only want the watermark visible on close inspection — up to 80%, suitable for high-contrast notices like CONFIDENTIAL that should be impossible to miss.

Font size auto-fits to the page so the watermark spans roughly 80% of whatever dimension it runs along. You can override the size with a slider if a specific spec calls for it (some legal templates want a 48-point CONFIDENTIAL exactly). Color is picked from the same palette as the editor's other annotations — pure gray is the default since it works under both light and dark page content. The watermark is baked into the saved PDF, so every recipient sees it regardless of which reader they open the file in.