How to Change Slide Size in PowerPoint
Change PowerPoint slide size from the Design tab. Switch between 16:9 and 4:3, set custom dimensions, and pick Maximize or Ensure Fit safely.
PowerPoint keeps all slide dimensions in one place: the Design tab. Open your deck, click Design > Slide Size, and choose Widescreen (16:9), Standard (4:3), or Custom Slide Size. The change applies to every slide at once — a single deck can’t mix sizes — so it pays to set your size before you build the content. On PowerPoint for the web the Slide Size button offers only Standard (4:3) and Widescreen (16:9); Custom Slide Size and exact dimensions are a desktop-only feature.
Switch between widescreen and standard
Widescreen 16:9 has been the default since PowerPoint 2013 and measures 13.333 x 7.5 inches, matching modern monitors and TVs. Standard 4:3 (10 x 7.5 inches) suits older projectors and some printed handouts. The Slide Size button sits at the far-right end of the Design ribbon; click it and pick the ratio you need.
| Preset | Aspect ratio | Dimensions | Best for |
|---|---|---|---|
| Widescreen | 16:9 | 13.333 x 7.5 in | Modern screens, video |
| Standard | 4:3 | 10 x 7.5 in | Older projectors, handouts |
Set an exact custom size
For anything else — a poster, a square social image, or A4 paper — choose Custom Slide Size. In the dialog you can type a width and height (PowerPoint accepts up to 56 inches per side), switch orientation between portrait and landscape, or pick a ready-made format from the Slides sized for menu (A3, A4, Banner, and more). You can enter measurements in inches, centimeters, or pixels.
Keep your content from breaking
If a slide already holds content, PowerPoint asks how to rescale it. Maximize keeps items large but can push them past the edges; Ensure Fit shrinks everything so nothing gets cropped.
| Option | What it does | Use when |
|---|---|---|
| Maximize | Fills the new size, may crop | Moving to a larger slide |
| Ensure Fit | Scales down, nothing cut off | Going smaller, or unsure |
The same “set it up first” habit saves rework across Office — changing margins in Word is far easier before you pour in text, too. And once the deck looks right and you plan to send it out, you can password-protect the exported PDF before sharing.
Change the size first, then design. Resizing a finished deck almost always means nudging text boxes and images back into place, so commit to 16:9 (or your custom size) on slide one and build from there.
Common questions
Can I change slide size in PowerPoint for the web?
Yes, but only between Standard (4:3) and Widescreen (16:9) from the Design tab. Custom dimensions and the ready-made paper sizes are available only in the desktop app.
Can I use a different slide size for each slide in PowerPoint?
No. A slide size applies to the whole presentation, so every slide shares the same dimensions. To mix sizes you would split the content across separate files.
What is the largest custom slide size in PowerPoint?
In the desktop Custom Slide Size dialog you can set each side up to 56 inches, which covers large posters and banners.
How do I change slide size without stretching my images?
When PowerPoint asks how to rescale, choose Ensure Fit. It shrinks content to stay inside the new dimensions so nothing is cropped, though it may leave extra empty space around the edges.