Quick summary
Changing a PowerPoint theme online takes just a few clicks inside the Design tab on Microsoft PowerPoint for the web. Open the Themes Gallery, pick a new theme, and your entire presentation updates instantly.
Steps
- Inside the slide canvas, go to the top menu bar and click 'Design'.
- Navigate to the Themes Gallery and click the drop-down arrow next to it to view the full theme collection.
- Find and select the new theme you want to apply to your presentation.
- The theme color of your online PowerPoint presentation will be updated across all slides automatically.