Google Slides logo against a yellow gradient background.

The default slide size (16:9) in Google Slides works for most situations, but you may occasionally want to change the aspect ratio depending on the situation. There are a few presets, but you can also customize the slide size.

Adjust Aspect Ratio in Google Slides

To change the size of your slides in Google Slides, you need to open the presentation that contains the slides you want to resize. Once open, click “File” in the menu bar.

In the menu bar, click File.

Next, click “Page Setup” in the drop-down menu that appears.

Click Page Setup in the drop-down menu.

The Page Setup window will appear. Click the down arrow in the text box to show a list of slide size options.

Click the menu in the Page Setup pop-up window

In the list you’ll see these options:

  • Standard 4:3 – Choose this aspect ratio if you plan to print out your slides or if someone will view them on a mobile device.
  • Widescreen 16:9 – This is the default setting and should be used when viewing on a widescreen.
  • Widescreen 16:10 – This is another option for when viewing on a widescreen.
  • Custom – Choose this if you need to select a size that isn’t displayed in the list of presets.

Click the size you want from the list.

A list of slide size options.

If you choose “Custom,” you can enter the width (first box) and height (second box) of the slides. You can also choose which unit of measurement to choose from, with inches, centimeters, points, and pixels being your options.

Set the custom slide size.


Regardless if you choose a preset option or set your own custom size, click “Apply” when you’re ready to reflect the change to your slides.

Click Apply to reflect the change.

That’s all there is to it.

Changing the size of your slides is one of the basic skills you need to learn to master Google Slides. If you decide you’d rather use PowerPoint, you can convert your Google Slides to PowerPoint and resize your slides there, too.

RELATED: How to Change Slide Size in Powerpoint

Profile Photo for Marshall Gunnell Marshall Gunnell
Marshall Gunnell is a writer with experience in the data storage industry. He worked at Synology, and most recently as CMO and technical staff writer at StorageReview. He's currently an API/Software Technical Writer at LINE Corporation in Tokyo, Japan, runs ITEnterpriser, a data-storage and cybersecurity-focused online media, and plays with development, with his RAID calculator being his first public project.
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