Add a DRAFT watermark to the background of slides
PowerPoint doesn't have a gallery of ready-made watermarks like Word has, but you can still manually put a text background in your slides to get that watermark effect.
To indicate that your presentation is a draft copy, add the watermark text "Draft" to the background of your slides. Or add other text stamps, such as "Company Confidential" or your company name.
Add a watermark
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Select View > Slide Master.
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Scroll to the top of the thumbnail pane and select the Slide Master at the top.
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Select Insert > Text Box, then drag to draw a text box on the slide.
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Type the text you want in the text box.
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Choose a light font fill color and make any other changes to the font and style.
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Click and hold the rotation handle at the top of the text box by moving the mouse left or right.
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Select Slide Master > Close Slide Master. All slides in your presentation will have the watermark text.