The best time to set slide size is when you first set up your PowerPoint presentation before you add any content. You can also enter a custom slide size if you prefer (including entering slide size in pixels). The default slide size or dimensions in 2013, 2016, 2019 or 365 is widescreen (16:9 aspect ratio) and in 2010 and earlier versions, the default is standard (4:3 aspect ratio). You can change the slide size or aspect ratio of a PowerPoint presentation in all versions. Change PowerPoint Slide Size (Widescreen, Standard or Custom)īy Avantix Learning Team | Updated August 26, 2021Īpplies to: Microsoft ® PowerPoint ® 2010, 2013, 2016, 2019 and 365 (Windows)