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Select the View tab, then select Slide Master.
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 Select the first slide in the navigation pane on the left.
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Select the Insert tab, select Pictures, then choose an image source.
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Choose your logo file, then select Insert. You can drag the image to change its size or location on the slide.
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When you're done, select Slide Master > Close Master View.
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On the View tab, select Slide Master.
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 Select the first slide in the navigation pane on the left.
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Go to Insert > Pictures and choose an image source.
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Choose your logo file, then select Insert or Open. You can drag the image to change its size or location on the slide.
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When you're done, select Slide Master > Close Master View.
Using the Slide Master isn't currently possible in PowerPoint for the web. You can, however, use the Slide Master in the PowerPoint 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 PowerPoint desktop app? Try or buy Microsoft 365.