Click Watermark. A watermark appears automatically in the Document > Watermark tab. Insert your watermark in Word — Microsoft Support How to add a watermark in Office — Office 365 FAQs How to Add a watermark to a Word document in Office In these Windows 10 guide, we will walk you through the steps to add or remove (and create custom) a watermark to a Microsoft Word document in Office. Using textile Word. Click the Blank document option in the Home section. Click the Design tab. In the “Page Background” section, click the Watermark option.