In PowerPoint, you can add a solid or gradient color, a pattern, or an image as the background of a slide or an entire presentation.
Format the slide background with color
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On the ribbon, select the Design tab.
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At the far-right end, select Format Background.
The Format Background pane opens on the right side of the window.
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Under Fill, select Solid fill, Gradient fill, or Pattern fill.
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Select a color and other accompanying options, as applicable.
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By default, the selections you make apply to the current slide. If you want them to apply to all slides in your file, at the bottom of the pane, select Apply to All.
Format the slide background with a photo
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On the ribbon, select the Design tab.
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At the far-right end, select Format Background.
The Format Background pane opens on the right side of the window.
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Under Fill, select Picture or texture fill.
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Under Picture Source, select Insert.
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Choose where you want to get the image from, then navigate to the image, select it, and select Insert.
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Adjust other settings as needed, such as the transparency of the image.
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By default, the selections you make apply to the current slide. If you want them to apply to all slides in your file, at the bottom of the pane, select Apply to All.
