There are three basic ways you might want to merge PDF pages or merge entire PDF files.
Option 1:
1, Click Tools on the main menu -> Editor -> Merge;
2, Or tap Editor on the toolbar -> Merge;
3, Add Files you want to combine;
4, Set the page range and page size as you desire.
Option 2:
1, On the main menu, click File -> Merge PDF Files;
2, Select the PDF file(s) you want to add to the existing one and press Open;
3, Set the page range and page size as you desired.
Option 3:
1, Select Page Edit -> Append -> Add Files;
2, Add one or more PDF files to merge in batch.