Change slide size from the Design tab

Open your presentation in PowerPoint and go to the Design tab at the top of the screen. On the right side of the ribbon, you'll see a button labeled Slide Size. Click it to see preset options: Standard (4:3 aspect ratio), 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 choose Custom Slide Size at the bottom of the menu. A dialog box opens where you can enter exact width and height measurements in inches, centimeters, or another unit. Set your dimensions and click OK. PowerPoint will apply the new size to every slide.

When you change size, PowerPoint scales existing content to fit the new dimensions. Text, images, and shapes resize automatically, though you may need to adjust spacing or positioning afterward if the new aspect ratio is very different from the old one.

Key Takeaways

  • The Design tab contains the Slide Size button, which offers Standard (4:3) and two Widescreen options (16:9 and 16:10) as presets.
  • Custom Slide Size lets you enter exact measurements if the presets don't match your needs.
  • Changing slide size applies to all slides in the presentation at once, not individual slides.
  • Content scales automatically when you resize, but you may need to adjust text boxes, images, or spacing to look right in the new format.

Why slide size matters before you start

Slide size affects how your presentation looks on different screens and devices. Standard (4:3) is older and more square; it works well for projectors in older conference rooms or when presenting on a 4:3 monitor. Widescreen (16:9) is the modern default and matches most laptops, tablets, and modern projectors. If you're unsure, 16:9 is the safest choice for most situations.

Changing size after you've built your presentation can shift layouts and break formatting. If you know where you'll present, set the size early. If you're converting an old 4:3 presentation to widescreen, expect to spend time repositioning elements on each slide.

What happens to your content when you resize

PowerPoint doesn't delete anything when you change slide size, but it does scale and reposition. Text boxes, images, and shapes shrink or grow proportionally. If you go from Standard (4:3) to Widescreen (16:9), your slides become wider, and content may look small or off-center. If you go the other way, content may crowd together or get cut off at the edges.

After resizing, open each slide and check that text is readable, images aren't distorted, and nothing important got pushed outside the slide boundary. You can manually move and resize any element that doesn't look right by clicking it and dragging the corners or edges.

Reverting to a previous slide size

If you change your mind, go back to the Design tab and click Slide Size again. Choose the size you want to return to. PowerPoint will scale everything back, though it may not restore the exact layout you had before if you've edited slides since the change. If you made significant changes and want to undo the resize completely, use Ctrl+Z (or Cmd+Z on Mac) immediately after resizing, before you edit anything else.

For older presentations, you can also save a copy under a different name before resizing, so you always have the original version if you need it.

Slide size for different output formats

If you're saving your presentation as a video or exporting slides as images, the slide size affects the output dimensions. A Standard (4:3) presentation exported as images will be squarer; a Widescreen (16:9) presentation will be wider. Choose the size that matches where the presentation will be viewed. For web use, 16:9 is standard. For printing handouts, either size works, but 16:9 uses less paper.

When you export to PDF or print, PowerPoint respects the slide size you've set. If your slides are custom dimensions, make sure they fit on the paper size you're using, or PowerPoint will shrink them to fit, which can make text hard to read.

Frequently Asked Questions

Can I make different slides different sizes in the same presentation?

No. PowerPoint applies slide size to the entire presentation at once. Every slide must be the same size. If you need slides of different dimensions, you'll have to create separate presentations and combine them in a video editor or presentation software that supports mixed sizes.

What's the difference between 16:9 and 16:10 widescreen?

16:9 is slightly wider and shorter; 16:10 is slightly taller and narrower. Most modern screens and projectors use 16:9. Use 16:10 only if you know your display is 16:10 (some older laptops and monitors were). When in doubt, choose 16:9.

Will changing slide size mess up my animations and transitions?

No. Animations and transitions stay attached to the same elements and play the same way. Only the position and size of the content on the slide changes. You may need to adjust timing or positioning if content moved significantly, but the animations themselves won't break.

What measurements should I use for a custom slide size?

Standard is 10 inches wide by 7.5 inches tall. Widescreen (16:9) is 10 inches wide by 5.625 inches tall. If you need a custom size, measure the screen or space where you'll present and calculate the aspect ratio (width divided by height). Enter the width and height you want, and PowerPoint will create that size.