Question

How to combine two PDF files of A4 size into a single PDF file of different size (e.g. A3)? As the page added in the PDF Editor is of the A4 page size. How to combine files to a specific size?

Answer

To combine two files into one file of a specific size (A3, A5, B4, etc.), please follow the next steps: 

1. Open the pages in PDF Editor and click on the Print Document option (or press Ctrl+P).
2. In the opened window: select Microsoft Print to PDF as printer.
3. Set the required size and layout per sheet for the pages, as per the screenshot below:
   
4. Click Print and save the file.

Additional information

Setting the same paper size for all pages of a PDF file in FineReader PDF