Applies To
PowerPoint for Microsoft 365 PowerPoint for Microsoft 365 for Mac PowerPoint for the web
  1. Go to Design > Slide Size > Custom Slide Size. 

  2. Under Slides sized for, open the list and select a predefined slide size. (Or manually specify the Width and Height you want.)

  3. Under Orientation, choose Landscape or Portrait and then select OK.

  4. If prompted, choose Maximize to allow the content to use all available space or Ensure Fit to make content fit into the resized page.

Tip: To set up slide numbering, see Add slide numbers.

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