Sometimes, the basic background of a slide, along with the variety of options that Google gives you, isn’t enough. From the theme of the entire thing to the background of specific slides, you can change it all to your heart’s content. Google Slides offers a quick and easy way to put together a presentation, and comes with plenty of ways to customize the look of your slides. Need to create and upload a custom image for Google Slides? I'll show you how to make any image the ideal background, all online.