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Widescreen (16:9 aspect ratio) is the default in 2013 and later versions of PowerPoint and standard (4:3 aspect ratio) is the default in 2010 and earlier versions.

You can also enter a custom slide size if you prefer (including entering slide size in pixels).

The best time to set slide size is when you first set up your PowerPoint presentation before you add any content.

If you change the size later in the process, you may have to deal with distorted pictures and you may also need to adjust the position and size of various objects on slides in Normal View and in the slide master(s) and layouts in Slide Master View.

Older projectors used the standard aspect ratio but most new projectors are designed for widescreen.

If you already have a presentation with images and other content, its also a good idea to change slide size on a copy of the presentation so you can keep the original deck and slide size.

Buttons on the Ribbon may appear as icons only and are also affected by screen size and display settings.

Be sure to check the slide master(s) and layouts in Slide Master View as well.

If youd like to set a custom size, enter the desired dimensions.

Simply choose options from the Slides sized for drop-down menu in the dialog box (such as A4 paper size) or enter custom dimensions.

If you would like to change the measurement system, check out our article on How to Change the Measurement System in PowerPoint.

If you enter slide size in pixels (such as 200px), when you tab to another box or close the dialog box, PowerPoint changes the pixels to the equivalent in the current measurement system.

Images on slides in Normal View will be affected as well as images on the slide master(s) and layouts.

If pictures are distorted, you will need to either manually resize each image or delete them and insert them again.

You may need to move objects or reset one or more slides (on the Home tab in the Ribbon, click Reset in the Slides group).

You may need to move or resize objects and adjust the slide master(s) or layouts in Slide Master View.

In 2013 and later versions, the default is widescreen (16:9 aspect ratio).

You should also check the slide master(s) and layouts in Slide Master View.

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Set Powerpoint For Widescreen In Mac