The most foolproof way to do this on a mac is the following. Note. This will also provide the lowest filesize pdf possible. On Powerpoint, select File > Export… Select File Format > JPEG (at the bottom of the pop-up window) Locate the JPEG export in Finder (it should be in a folder) Set the size > Width. 1920 Height. 1080 (or a size of your choice, but this is a safe standard) Open the folder and select all (cmd + a) Right click, Open With > Preview Preview will load with the thumbnails of your deck in order on the left Select all of the thumbnails by clicking on one then cmd + a Select File > Print… Select Paper Size > Manage Custom Sizes… Select the + button below the empty list on the left of the pop-up window (this should be to the left of a - button and a duplicate button) Type in the Paper Size. 1920mm (width) 1080mm (height) then press OK Select the bottom left most dropdown (default input should be PDF) and select save as PDF Define your PDF title etc. Press save. Double check your PDF for correct formatting and ordering.
Print it out. On the desktop of that Mac, copy the PDF file to your desktop of desktop Mac and open up a PDF viewer. Copy the file name from your desktop of Mac and paste into Excel. Then save the file as a .XPS on the desktop of desktop Mac (do not use the .psd extension) On the desktop of desktop Mac, open PDF to get an idea of your final page count.