How does a PDF file insert a blank page and set the page size?

How does a PDF file insert a blank page and set the page size?

1, first of all, we have the corresponding PDF file to edit the file is the prerequisite to open the PDF file. We can search in Baidu can be implemented on the PDF file editing tools to open the corresponding PDF file. The effect of opening the file is as shown in the figure:

2, then we can use the PDF editor to open the corresponding PDF file. Click on the Document menu in the PDF Editor menu bar, and in the document Pull-down menu we choose to click the Insert Page option. Choose to insert a blank page.

3, in the pop-up Insert blank page interface, we can see the inserted page type has a basic type of document page and standard page. Of course, we can also customize the page size.

4, in the Custom Insert Page option, we can add to the page size from the point, type and other units set to determine the new page.

5, as shown in the Add New page effect, of course, we added the new page size and size of the final PDF file page size and other pages equal to appear harmonious.

How does the