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Display PDFs and images as a slideshow in Preview on Mac
You can open and display multiple PDFs and image files as a slideshow. You can also display the pages of a single PDF as a slideshow.
- In the Preview app  on your Mac, open each file that you want in the slideshow. on your Mac, open each file that you want in the slideshow.- If you open a single PDF, the pages of the PDF will be displayed in the slideshow. 
- Choose View > Slideshow. 
Use the controls at the bottom of the screen to move from page to page or end the slideshow.