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.
Click on “File” menu and select the PDF file then click on save as‥.