Open the Design tab to change your slide dimensions

In PowerPoint, slide size lives in the Design tab at the top of the screen. Click Design, then look for a button labeled "Slide Size" on the right side of the ribbon. Click it and you will see two preset options: Standard (4:3 aspect ratio, the older square shape) and Widescreen (16:9, the modern rectangular shape). Pick the one that matches your display or your audience's setup, and PowerPoint will reformat every slide in your presentation at once.

If neither preset fits what you need, click "Custom Slide Size" at the bottom of that same menu. A dialog box opens where you can type in exact dimensions in inches or centimeters. This is useful if you are printing to a specific paper size, projecting on an unusual screen, or creating slides for a particular platform that has its own requirements.

PowerPoint will ask whether you want to maximize or may support fit when you change sizes. Maximize scales up your content to fill the new space; may support fit shrinks everything to prevent cutoff. For most work, maximize is the safer choice because it uses the screen real estate you now have available.

Key Takeaways

  • Slide size is in the Design tab under the Slide Size button, and changing it reformats your entire presentation at once.
  • Standard (4:3) is the older square format; Widescreen (16:9) is the modern rectangular format that matches most modern displays.
  • Custom Slide Size lets you enter exact dimensions if you need to match a specific paper size, screen, or platform requirement.
  • When you resize, choose Maximize to scale content up or may support Fit to shrink content down and prevent cutoff.
  • Changing slide size after you have built your presentation may shift text boxes and images, so do it early if possible.

Why widescreen (16:9) is the default choice for most presentations

Widescreen became the standard because it matches the screens people actually use. Projectors, monitors, TVs, and phones all use 16:9 or wider aspect ratios now. If you present to a room with a modern projector or display, widescreen slides will fill the screen without black bars on the sides. Standard 4:3 slides will have empty space on the left and right, which looks unfinished and wastes the display.

The only reason to use Standard is if you know your venue has an older projector or you are archiving slides from a presentation made before 2010. Even then, most modern equipment can stretch 4:3 content to fit, though it may distort images. When in doubt, widescreen is the safer bet.

How to handle content that shifts when you resize

When you change slide size, PowerPoint tries to keep your text and images in roughly the same place, but it does not always succeed. Text boxes may move, images may shrink, and carefully positioned elements can end up in the wrong spot. The larger the change — for example, going from Standard to Widescreen — the more likely you are to see problems.

The best approach is to choose your slide size before you build your presentation. If you inherit a presentation in the wrong size, open it, change the size, then go through each slide and fix any broken layouts. Pay special attention to title slides, which often have centered text that can look off-center after a resize, and slides with multiple images side by side, which may overlap or stack differently.

If you have a presentation with a lot of custom positioning, consider exporting it as a PDF before resizing. That locks the current layout in place. You can then create a new presentation in the correct size and copy the content over manually if needed.

Custom sizes for specific platforms and print formats

Some platforms have their own slide size requirements. Instagram Stories are 1080 × 1920 pixels (a tall vertical format). LinkedIn carousel posts are 1200 × 627 pixels (a short horizontal format). If you are creating slides for one of these platforms, use Custom Slide Size and enter those dimensions.

For printing, match your slide size to your paper. Standard letter paper is 8.5 × 11 inches; if you want slides to print one per page without shrinking or stretching, set your slide size to 10 × 7.5 inches (which is 4:3 ratio) or 10 × 5.625 inches (which is 16:9 ratio). This leaves room for margins and keeps the aspect ratio correct.

If you are unsure what size you need, ask the person or platform that requested the slides. They can tell you the exact dimensions or point you to their documentation. It is faster than guessing and resizing later.

Changing size in PowerPoint Online versus the desktop app

PowerPoint Online (the free version in your web browser) has limited slide size options. You can switch between Standard and Widescreen, but you cannot create custom sizes. If you need a custom dimension, you must read the presentation, open it in the desktop version of PowerPoint, change the size there, and upload it back.

The desktop app (PowerPoint for Windows or Mac, or part of Microsoft 365) has the full range of options including Custom Slide Size. If you work mostly in the browser but occasionally need custom sizes, keep the desktop app installed for those moments.

What happens to your slide master when you resize

Your slide master — the template that controls the background, fonts, and layout of all your slides — also resizes when you change slide dimensions. If your master has a background image or a specific design, it will stretch or shrink to fit the new size. Sometimes this looks fine; sometimes the image distorts or the layout breaks.

If you use a custom template or a professionally designed master, test the resize on a copy of your presentation first. Open a duplicate file, change the size, and see whether the master still looks right. If it does not, you may need to edit the master itself to fix the layout for the new dimensions. This is usually a job for whoever created the template, not something you need to do yourself.

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 one slide to be a different size, export it as an image, create a separate presentation in the size you need, and insert the image as a new slide.

What size should I use if I am presenting on a laptop screen?

Widescreen (16:9) is the standard for laptops and external monitors. It will fill a modern display without black bars. If your laptop is older or has an unusual screen ratio, check your display settings to see what aspect ratio it supports, then match that.

Will changing slide size affect my animations or transitions?

Animations and transitions stay attached to their slides and will not disappear when you resize. However, if an animation is timed to move an object to a specific location, the new slide dimensions may change where that object ends up. Review animated slides after resizing to make sure the motion still looks right.

What if I change the size and some text gets cut off?

Click on the text box and manually resize it to fit the new slide dimensions. You may also need to reduce the font size or rewrite the text to be shorter. may support Fit mode (which you choose when resizing) should prevent cutoff, but if text still disappears, this manual fix is the fastest solution.

Can I save different versions of the same presentation in different slide sizes?

Yes. Open your presentation, change the size, and use File > Save As to save it with a new name. The original file stays unchanged. This is useful if you need the same slides in both Standard and Widescreen, or in multiple custom sizes for different platforms.