How to change the background of your PowerPoint slides 1. Open PowerPoint on your Mac or PC and create a new presentation or open one you've already started.

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.

Step 1: Open your Powerpoint document and select the slide that you want to change the background for, on the left-hand side. In this example, we're using the standard template for an ...

Enter a text box that contains your message. Use PowerPoint’s Merge Shapes to “cut out” the text, so you can see the slide’s background through the transparent text.