In PowerPoint for the web, slide backgrounds extend to the edges of the slide. But when you print, a white margin appears around the edges of the slide. This is because most printers can’t do borderless printing.
Some printers have a 'margin' option you can adjust that may make white margins smaller, but it still may not eliminate them entirely.
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Select File > Print > Print Full Page Slides.
In the Print dialog box, look for a More settings link and select it.
Look for 'Advanced' options or a 'Margins' option that you can adjust, such as in the example below:
Here's how to change slide size in Keynote: 1. Click Document in the top right corner. Click Standard. Choose Widescreen or Custom Size. If you select the latter, you'll be given the options to name custom height and width in pixels. You've changed the size of your presentation slides.