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On the Design tab, selectÂ
 Watermark and choose  ​​​​​​​Custom Watermark. -
Select Picture watermark and choose Select Picture.
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Navigate to the picture you'd like to use as a watermark and select OK.
Adding a watermark isn't currently possible in Word for the web. You can, however, add a watermark in the Word desktop app.
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To open the desktop app, at the top of the ribbon, select Editing > Open in Desktop App.
Don't have the Word desktop app? Try or buy Microsoft 365.
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On the Design tab, selectÂ
 Watermark and choose Select Picture. -
Set the Scale and Washout and select OK.