A 16:9 slide is 78% wider than it is high. A 4:3 slide is 33% wider than it is high. But the actual size of a slide with the same aspect ratio can differ. “4:3” and “16:9” refers to the aspect ratio of the slide. The last couple of years, the two slide sizes have started to be used side by side – with different consequences. Why is there even different sizes of slides? The 4:3 slide dimension is the historical size – it stems from the age of analog TV screens and was the standard screen size up until about 10 years ago when widescreens started to become a more common size for TVs and computer screens. So – what size should you use for your slides? This is a quick guide to choosing the right size – and a brief explanation of the difference between the sizes in different versions of PowerPoint. When PowerPoint 2013 came along, the size of the default presentation changed from 4:3 to 16:9.
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