How to change slide size in PowerPoint

Open PowerPoint and go to the Design tab on the ribbon at the top. Click Slide Size on the right side of the ribbon — it shows a small rectangle icon. A dropdown menu appears with preset sizes: Standard (4:3), Widescreen (16:9), and Widescreen (16:10). Select the size you want, and PowerPoint will resize all slides in your presentation at once.

If none of the presets match what you need, click Slide Size again and select Custom Slide Size at the bottom of the menu. A dialog box opens where you can enter exact width and height measurements in inches or centimeters. Set your dimensions and click OK. PowerPoint will apply the custom size to every slide.

The change happens immediately, but PowerPoint may ask whether you want to Maximize or Ensure Fit when resizing. Maximize stretches content to fill the new slide size; Ensure Fit shrinks content to fit without cutting anything off. Choose based on whether your slides have a lot of text or images that might look distorted if stretched.

Key Takeaways

  • Standard (4:3) is the older, squarer format; Widescreen (16:9) is the modern rectangular format used by most projectors and screens.
  • Changing slide size resizes all slides in your presentation at the same time, not one at a time.
  • Custom Slide Size lets you enter exact measurements if the preset options do not match your needs.
  • PowerPoint will ask whether to maximize or ensure fit when resizing; maximize stretches content, ensure fit shrinks it.
  • Changing size after you have built slides may cause text boxes and images to shift or overlap, so decide on size early.

When to use Standard versus Widescreen

Choose Standard (4:3) only if you are presenting on an older projector or screen that does not support widescreen. Most meeting rooms, classrooms, and conference halls built in the last ten years use widescreen displays. If you are unsure what equipment you will use, widescreen is the safer choice because it works on both old and new screens.

Widescreen formats give you more horizontal space for text, charts, and images. Standard format is taller and narrower, which can make slides feel cramped if you have a lot of content. If your presentation is mostly text-heavy slides, standard can work, but widescreen is generally more flexible for mixed content.

What happens to your existing slides when you resize

PowerPoint does not delete or lose any content when you change slide size. Text, images, shapes, and videos stay on your slides, but they may shift position or scale. A slide that looked balanced in standard format might have awkward spacing in widescreen, or vice versa.

After resizing, scroll through your presentation and check a few slides to see if anything needs adjustment. Text boxes might need to be repositioned, images might need to be resized, or spacing between elements might look off. The more slides you have, the more time this takes, which is why choosing your slide size before you start building is worth the effort.

How to resize slides in older versions of PowerPoint

In PowerPoint 2010 and earlier, the process is slightly different. Go to the Design tab, then click Page Setup instead of Slide Size. A dialog box opens where you can choose from preset sizes or enter custom dimensions. The result is the same — all slides resize at once — but the menu location and button name are different.

If you are using PowerPoint Online (the web version), click Design and look for Slide Size in the ribbon. The web version has fewer preset options than the desktop version, but custom sizing is still available. The steps are nearly identical to the desktop version.

Custom slide sizes for specific purposes

If you are creating slides for a specific format, you may need custom dimensions. For a 35mm slide, use 10 inches by 7.5 inches. For a banner or wide display, you might use 20 inches by 7.5 inches. For a square format (useful for social media or kiosks), use equal width and height, such as 10 inches by 10 inches.

Before you set a custom size, check with whoever will display or print your presentation. If slides are going on a specific screen or being printed at a particular size, the custom dimensions need to match that output. Asking first saves you from resizing everything twice.

Saving your slide size choice

PowerPoint saves your slide size choice with the presentation file. When you open the file again, it opens in the same size you last saved it in. If you share the file with someone else, the slide size travels with it — they will see the same dimensions you chose.

If you want to use the same custom size for multiple presentations, you can create a template. Build one presentation with your preferred slide size and content layout, then save it as a PowerPoint Template (.potx) file. When you create a new presentation from that template, it automatically starts with your chosen slide size.

Frequently Asked Questions

Can I have different slide sizes in the same presentation?

No. PowerPoint applies one slide size to the entire presentation. If you need some slides in one format and others in a different format, you must create separate presentation files and combine them during delivery, or use a presentation tool that supports mixed formats.

What slide size should I use if I do not know where I am presenting?

Use Widescreen (16:9). It is the current standard for projectors, monitors, and televisions. It works on older 4:3 equipment too, though the sides may be cut off. Standard (4:3) does not work well on modern widescreen displays because it leaves black bars on the sides.

Will changing slide size mess up my animations or transitions?

No. Animations and transitions stay attached to their slides and continue to work after resizing. Content position and size may shift, but the animations themselves do not break. You may need to adjust timing or positioning if elements move, but the animations are still there.

Can I undo a slide size change?

Yes. Use Ctrl + Z (Windows) or Command + Z (Mac) immediately after resizing to undo the change. If you have made other edits since resizing, undo will step back through those changes too. If you want to go back to a previous size after saving, open the file, change the size, and save again.

What happens if I print slides after changing the size?

PowerPoint will print at whatever size you set. If your custom size does not match your printer's paper size, PowerPoint will either scale the slides to fit or cut them off, depending on your print settings. Check the print preview before printing to see how your slides will look on paper.