Google Slides Background Image Size. Before you download a template, however, choose the Google Slides dimension that you want If you like this tutorial, you may also be interested in this Google Slides tutorial that explains how to add background images to a Google Slides presentation You can adjust slide sizes for your presentations. I need to resize an image to use as a background in Google Slides.
In Google Drive create a new Slides presentation.
To fix it, go back to the Google Drawing and go to File > Page setup.
Andy Wolber thinks you should always check your slides on your phone. I have already taken a look at this Q&A: Stack Exchange: What are the pixel dimensions of a presentation slide for Open Office/Libre Office Impress? But don't fear, Google breaks down the most common image sizes here.