Change the paper size when printing
If you want to change the paper size of your document (for example, print a US Letter-sized PDF on A4 paper), you can change the printing format for the document.
Click File ▸ Print
Select the Page Setup tab.
Under the Paper column, choose your Paper size from the drop-down list.
Click Print and your document should print.
You can also use the Orientation menu to choose a different orientation: