Try it!
Adding a graphic as a watermark behind the text of your slides is a great way to display a logo or other meaningful image. PowerPoint lets you adjust the picture's transparency after you put it on the slide.
To add a logo to all the slides:
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Select View > Slide Master. Scroll to the top of the thumbnail pane on the left, and select the first item, the slide master.
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Select Insert > Shapes. Pick a shape and then select and drag to draw the text box on the slide master. It should be about the same size as your logo.
Note:Â If your logo is circular, use a circle shape.
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Right-click on the shape and select Format Shape to open the menu.
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Inside Format Background, under Fill > Picture or texture fill.Â
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Select Insert under Picture source and insert your logo image. Adjust darkness of the logo with the Transparency slider.
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To remove the border around the image, select the logo and then right-click > Outline > No Outline.
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Exit Slide Master. All slides except title pages will have the logo.