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A watermark is text or an image that appears either in front of or behind existing document content, like a stamp. For example, you could apply a “Confidential” watermark to pages with sensitive information. You can add multiple watermarks to one or more PDFs, but you must add each watermark separately
If you want to add a text-based watermark, click "Text" and enter the text that you want to add to the document. Adjust the font, size and other settings as needed until the watermark looks right to you. If you'd prefer to use an image as a watermark, click "File," then "Browse" and find the image on your computer you wish to use as a watermark