Open the Pages document on your Mac
Click File
Select Export To
Choose PDF
Select the PDF quality if prompted
Click Next
Choose a save location
Click Export
On iPhone or iPad, open the Pages document
Tap the More button
Tap Export
Tap PDF
Choose how to share or save the PDF
On iCloud Pages, open the document in Pages for iCloud
Click the More button
Select Download a Copy
Choose PDF
Save the downloaded PDF file