Open the Design tab and select a new slide size

To change your slide size in PowerPoint, go to the Design tab on the ribbon at the top of the screen. On the far right side of the Design tab, you'll see a button labeled Slide Size. Click it, and PowerPoint shows you preset options: Standard (4:3), Widescreen (16:9), and Widescreen (16:10). Pick the one that matches how you want your slides to look, and PowerPoint applies it to your entire presentation.

If none of the presets fit what you need, click Custom Slide Size at the bottom of that same menu. A dialog box opens where you can type in exact width and height measurements in inches or centimeters. You can also choose whether slides are oriented in portrait (taller than wide) or landscape (wider than tall). Set your numbers, click OK, and PowerPoint resizes everything.

Key Takeaways

  • The Slide Size button lives in the Design tab on the ribbon, on the far right side.
  • PowerPoint offers three preset sizes: Standard (4:3), Widescreen (16:9), and Widescreen (16:10).
  • Custom Slide Size lets you enter exact measurements if the presets don't match your needs.
  • Changing slide size affects your entire presentation at once, not individual slides.
  • PowerPoint may ask whether to scale your content up or down to fit the new size.

What happens to your existing content when you resize

When you change from one slide size to another, PowerPoint asks what to do with the text, images, and shapes already on your slides. It gives you two choices: Maximize (which scales everything up to fill the new space) or Ensure Fit (which shrinks everything down so nothing gets cut off). Choose Maximize if you want bigger text and images. Choose Ensure Fit if you're worried about losing content or having things look cramped.

Either way, you should check your slides after resizing. Text that looked fine at one size may need adjustment at another. Images sometimes distort if they're stretched too much. Shapes and text boxes might land in awkward spots. Spend a few minutes scrolling through and fixing anything that looks wrong.

Standard versus widescreen: which one to pick

Standard (4:3) is the older format, shaped like an old television screen. It's taller and narrower. Widescreen (16:9) is the modern format, shaped like a movie screen or a laptop. It's wider and shorter. Most new projectors, monitors, and devices use 16:9, so Widescreen is usually the safer choice unless you know your presentation will be shown on older equipment.

If you're presenting in a conference room or classroom, ask what the projector supports before you finalize your size. If you're sharing slides online or emailing them, 16:9 works on almost everything. Standard (4:3) is rarely necessary unless you're working in a very old building or with very old hardware.

Custom sizes for specific needs

Custom Slide Size is useful when you need slides to match a specific format. For example, if you're printing slides on 8.5 by 11 inch paper, you might set your slide size to 10 by 7.5 inches to fit that paper without cutting off edges. If you're creating slides for a social media post or a digital billboard, you can match those exact dimensions.

When you enter custom measurements, think about the aspect ratio — the relationship between width and height. A 16:9 slide might be 10 inches wide by 5.625 inches tall. A 4:3 slide might be 10 inches wide by 7.5 inches tall. If you're unsure what dimensions to use, start with a preset size and adjust from there rather than guessing from scratch.

Where to find Slide Size in different PowerPoint versions

In PowerPoint for Windows (2016 and newer) and PowerPoint for Mac (2016 and newer), Slide Size is in the Design tab. In older versions of PowerPoint, it may be under the Slide menu instead. If you're using PowerPoint Online (the free version in your web browser), click the Design tab, then look for a button that says Slide Size or Page Setup on the right side of the ribbon.

If you can't find it, try using the search box at the top of PowerPoint (the "Tell me what you want to do" box) and type "slide size." PowerPoint will show you the command and take you to it. This works across all recent versions.

Saving your presentation after resizing

After you change your slide size and adjust your content, save your file. PowerPoint remembers the new size the next time you open that presentation. If you share the file with someone else, they'll see it in the size you set. If you want to change it back later, just go to Design > Slide Size again and pick a different option.

If you're working with a template or a presentation you reuse, consider saving a version with your preferred slide size as a template. That way, every new presentation you create from it will start with the right dimensions, and you won't have to resize each time.

Frequently Asked Questions

Can I change the size of just one slide instead of the whole presentation?

No. PowerPoint applies slide size to the entire presentation at once. If you need different sizes for different slides, you would have to create separate presentations and combine them, or use a workaround like inserting a different-sized object on a single slide.

What if my text gets too small after I resize?

Increase the font size manually. Select the text box or text, then use the font size dropdown in the Home tab to make it larger. You may also need to reposition text boxes or images to balance the new layout.

Will changing slide size affect my animations or transitions?

Animations and transitions stay in place, but they may look different on the new slide size. Check them after resizing to make sure they still work the way you want.

What's the best slide size for online presentations?

Widescreen (16:9) is the standard for online presentations, video calls, and most modern displays. It works on laptops, tablets, projectors, and streaming platforms without requiring adjustment.