A4 pdf spliced into A3 pdf

how to integrate an A4 PDF file into a horizontal A3 PDF file?
for example: the first page and the second page of A4 are merged into the horizontal first page of A3
as shown in figure:

Mar.06,2021

Brother, I've been answering you for such a long time that you shut down the question without thanking me.


use third-party controls

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