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How to change the size of a PowerPoint slide
Formatting a PowerPoint presentation correctly allows you to fit all necessary content on each slide. If you find you have too much or too little space, you may need to change your slide size accordingly. Here’s how to change slide size in PowerPoint.
QUICK ANSWER
To change slide size in PowerPoint, go to Design > Slide Size > Custom Slide Size…. Customize the width, height, and which slides the new slide size will apply to. When ready, click OK to apply.
How to change slide size in PowerPoint
In your PowerPoint, go to the Design tab.

Within the Customize section, click the Slide Size button.

Click Custom Slide Size… to fine-tune your slide size in PowerPoint.

Customize the width and height you want for your slide and which numbers your new slide size will apply to. If you aren’t sure, click the Slides sized for dropdown to choose from the most popular formats and sizes.

Click OK when you’ve finished customizing or selecting your new slide size.

Choose either Maximize (to maximize the size of your content) or Ensure Fit (to scale down current content to fit the new slide size).

Your PowerPoint presentation’s slides will subsequently change to your new size.

Read more: How to curve text in PowerPoint