16:9-slides works for projectors, LCD screens and widescreen projectors (most boardroom projector shows 16:9). In general, 4:3-slides works for most projectors BUT when projected on LCD screens, the slide will not fill the screen and you might have black bars on the sides of the slide or the content will stretch and be distorted.
Use 16:9 for content created for an environment where the other presentations are created in 16:9. Use 4:3 for content created in an environment where most current presentations and the main organizational template in use is 4:3. Use 16:9 when creating content for specific platforms that shows best in 16:9 such YouTube and widescreens. Use 4:3 for content created for specific platforms that shows best in 4:3 such as Slideshare and iPads. Use 4:3/Letter/A4 size for content that is only going to be distributed/printed as a sliduement and never really to be shown on a screen. Use 16:9 if you are creating highly visual content that is only going to be shown on a screen – for a keynote or a conference presentation. Use 4:3 if your are creating multi-purpose content that is going to be shown across different platforms and to be printed as documentation. So what slide size should you use for a presentation? It really depends on what you are trying to create – and partly personal preference. 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.
#How to find the size of a powerpoint slide tv#
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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