After you create your PowerPoint presentation, you can save it as a video to share with others.
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Select File > Export > Create a video.

Create a Video
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Select the quality of the video:
Ultra HD (4K) - Largest file size and ultra-high quality (3840 x 2160).
Full HD (1080p) - Large file size and full high quality (1920 x 1080).
HD (720p) - Medium file size and moderate quality (1280 x 720).
Standard (480p) - Smallest file size and lowest quality (852 x 480).
Standard Size
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Decide if you want to:
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In the Seconds spent on each slide box, select the default time you want to spend on each slide.
Seconds
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Select Create Video.
Create Video
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Enter a file name and then browse to the location you want to save your video.
Name File
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In the Save As type box, select if you want to save the video as a MPEG-4 Video or Windows Media Video.
Save As Type
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Select Save.
Save
It will take some time to generate the video. Check the progress bar at the bottom of the window to see when it's complete.