Launch Microsoft PowerPoint, and open the PPTX file for which you want to use a GIF as the background. Select the appropriate slide. Click the "Design" tab, and locate the "Background" section.

Another free PowerPoint template that’s appropriate for most any type of presentation is this abstract design. You have bright colors on a soothing black background for a professional yet lively ...

To copy a picture as a background in PowerPoint, you need to go to the Design tab and click on the Format Background option. choose the Picture or texture fill option and click the Insert button.