1. Select File > Export > Create a video.

  2. Select a resolution for the video:

    • Ultra HD (4K): Largest file size and ultra-high quality (3840 x 2160). (Only available in newer versions of PowerPoint.)

    • 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).

  3. Decide if you want to:

    • Use Recorded Timings and Narrations

    • Don't Use Recorded Timings and Narrations

  4. In the Seconds spent on each slide box, select the default time you want to spend on each slide.

  5. Select Create Video.

  6. Enter a file name and then browse to the location you want to save your video.

  7. In the Save As type box, select if you want to save the video as a MPEG-4 Video or Windows Media Video.

    Tip: The MPEG-4 Video format is recommended for the best compatibility with video players.

  8. Select Save.

  9. 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.


Source: Microsoft