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How to Change Slide Size in PowerPoint (16:9 vs. 4:3)

Tap through the steps to change slide size in PowerPoint.

  1. Open the "Design" tab

    Click the "Design" tab in the top menu.

  2. Click "Slide Size"

    Click the "Slide Size" button on the far right of the ribbon.

  3. Choose 16:9 or 4:3

    Pick widescreen (16:9) to match modern displays, or the older standard ratio (4:3), depending on your needs.

  4. Choose how content should scale

    Changing the ratio brings up a prompt asking whether to scale existing content with "Ensure Fit" or "Maximize."

  5. Set a fully custom size

    If you need dimensions that don't match a standard ratio, "Custom Slide Size" lets you enter exact width and height values yourself.

Make your presentation fit modern screens

Most monitors and projectors today use a 16:9 widescreen format. Matching your slide ratio to the display means your presentation fills the screen edge to edge instead of leaving letterboxed bars on either side.

It's also worth checking your export size for other formats

If you're repurposing slides as a PDF handout, a video, or an image for social media, it's worth double-checking the export dimensions match what that destination actually expects, since a slide ratio built for a screen doesn't always translate cleanly to print or square formats.

Frequently Asked Questions

Does changing the ratio distort my images?

Choosing "Maximize" enlarges content and can crop it, while "Ensure Fit" preserves the original proportions of images but may leave empty space around them.

Which ratio works best for printed handouts?

If you're printing on standard paper, the 4:3 ratio often uses the page space more efficiently than widescreen.