You can add a watermark, which is faint text that appears behind information in a document, to your document to add interest or convey a message.
Watermarks are visible in Print Layout view and when you print your document.
Click
Click Format.
Click Background.
Click Printed Watermark.
The Printed Watermark dialog box appears.
Click the Text watermark option ( You can use these options to control the font, size, color, intensity, and layout of the watermark.
Click OK.
Word displays the watermark on each page of your document.
What happens if I click Picture watermark option in the Printed Watermark dialog box?
Word enables you to select a picture stored on your hard drive to act as the watermark in your document.
Follow steps 1 to 5, selecting Picture watermark in step 5.
In the Printed Watermark dialog box, click Select Picture.
In the Insert Picture dialog box, navigate to the location on your hard drive containing the picture you want to use as a watermark.
Click Insert.
Click OK to add the picture watermark to your document.