The default size for a PowerPoint slide is 10 inches by 7.5 inches, which is also 1024 x 768 pixels at 96dpi. However, the size of a PowerPoint slide can be changed to fit specific needs. The minimum width or height of a slide is 1 inch or 2.54 cm, and the maximum width or height is 56 inches or 142.24 cm. The sizing applies to all slides in a presentation, and all slides in a presentation are the same size. The orientation also applies to all slides in a presentation. To change the size of a slide, go to the Design tab on the ribbon and select Slide Size/Widescreen on the right side of the screen. After selecting the new size, everything on the slides will be stretched out or squished to fill the space, so it is important to go through the presentation slide by slide to ensure that everything looks good.