You can add an image to the background of any or all of your slides. Using a faded picture as a watermark in the background of your slides is a great way to display your company logo or other meaningful picture.
1. Open the Format Background pane
To apply a background to a single slide:
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On the View tab, click Normal.
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Select the slide to which you want to add a background image.
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On the Design tab, click Format Background.
To apply a background to all slides:
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On the View tab, click Slide Master.
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In the Slide Master view, select the slide master at the top of the thumbnail pane on the left.
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On the Slide Master tab, click Background Styles.
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Click Format Background.
To apply a background to all slides that are based on a particular slide layout:
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On the View tab, click Slide Master.
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In the Slide Master view, in the thumbnail pane on the left, click the slide layout(s) that you want to add a picture background to.
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On the Slide Master tab, click Background Styles.
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Click Format Background.
2. Apply an image
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To insert a picture from your computer, click Picture or texture fill.
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Under Insert picture from, click File. (To insert a picture that you have copied to the clipboard, click Clipboard.)
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Locate and select the picture you want, and then click Insert. Your selected image will fill the background of all selected slides or slide layouts.
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To create a watermark effect, in the Format Background pane, slide the Transparency bar to the right to set the transparency percentage.
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If you want to apply your background image to all slides in the presentation, in the Format Background pane, click Apply to all.