When fine paper is held up to the light, it shows a watermark — an image embedded into the paper. The image is impressive but faint. Word 2016 lets you fake a watermark by inserting faint text or graphics behind every page in your document. Here's how:
Click the Design tab.
In the Page Background group, click the Watermark button.
A menu plops down with a host of predefined watermarks that you can safely duck behind the text on your document's pages.
Choose a watermark from the menu.
The watermark is applied to every page in your document.
To rid your document's pages of the watermark, choose the Remove Watermark command in Step 3.
To customize the watermark, choose the Custom Watermark command from the Watermark menu. Use the Printed Watermark dialog box to create your own watermark text, or import an image, such as your company logo.
The watermark appears on all pages in a document. It's unaffected by section breaks.
If the watermark doesn't show up in the printed document, you may need to enable the Print Background Colors and Images setting.