If your background image is drawing unnecessary attention, or you need to blur part of an image that contains sensitive information, you can do so directly in PowerPoint. We’ll show you how.
Blur an Entire Image
First, open PowerPoint and navigate to the slide containing the image you want to blur. Select the image, and that automatically opens the “Picture Format” tab.
Next, select “Artistic Effects” from the “Adjust” group.
In the drop-down menu that appears, click the Blur option.
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Source: How-To Geek
