PDF watermark guide

How to Add a Text Watermark to a PDF and Choose Which Pages to Mark

Learn how to add a text watermark to a PDF, set its position, colour, opacity, size and angle, choose a page range, and inspect the exported file.

By Ankit Adarsha Behera · Updated 11 November 2026

What a PDF watermark is useful for

A watermark is text placed over document pages to communicate context, such as “Draft”, “Sample”, “Internal Copy” or a document owner's name. It can help readers recognise a document's status, but it should not be treated as a security control or proof of ownership by itself.

How to add a watermark with Convert Hau

1. Open the watermark guide and choose the Add Watermark tool.
2. Select the PDF you want to mark.
3. Enter the text you want to display.
4. Choose a placement, such as diagonal, centered, top-left or bottom-right.
5. Adjust the text colour, opacity, size and angle to suit the document.
6. Enter page numbers or ranges if you want to mark selected pages. For example, 1,3-5 selects pages 1, 3, 4 and 5. Leave the field blank to apply the watermark to all pages.
7. Review the first-page preview, process the file, then open the downloaded PDF and check the selected pages.

Choosing watermark settings

Text: Keep the wording short enough to remain readable. Placement: A centered or diagonal mark is more visible, while a corner placement may leave more of the page unobstructed. Opacity: Lower opacity can make the mark less intrusive, but it should still be visible against the page. Size and angle: Check both on pages with different layouts, because a setting that works on a portrait page may look different on a landscape page.

The current Convert Hau tool supports text watermarks. It does not currently accept an image or logo as the watermark source. The page-range field accepts page numbers and ranges; check the exported document to confirm that the intended pages were marked.

Common problems and checks

• If the watermark is hard to read, increase contrast or opacity and inspect the page at normal viewing size.
• If it overlaps important content, try a corner position or a smaller size.
• If only some pages should be marked, check the page-range syntax before processing.
• If the PDF contains pages with different orientations, inspect each orientation in the output.

File handling

The selected PDF is uploaded to Convert Hau's PDF service for watermark processing. The first-page preview helps you check the proposed appearance, but the downloaded file is the final result to inspect. See the Privacy Policy for the site's current file-processing description.