Page sizes can be changed by using the 'Set Page Size' feature within the Pages Pane in Nitro PDF Pro.
Within the Pages Pane, please right-click on a page or pages, and then from the ensuing menu select 'Set Page Size' as seen in the screenshot below.
Alternatively, the PDF page size can be changed by printing the PDF using the Nitro PDF Creator with a new page size set. This setting can be changed within the Printer Properties of the Nitro PDF Creator and by selecting the 'Pages' tab. Once within the Pages tab please set the dimensions to your choosing.
Please ensure to select the Page Scaling option which best matches your new page size.
For more information regarding how to use Nitro PDF Pro, please visit the following website for all our online resources: https://www.gonitro.com/support