Add, delete, or move PDF pages in Preview on Mac
You can open a PDF in Preview, then add, delete, and rearrange pages, or move pages from one PDF to another.
In the Preview app on your Mac, open the PDF you want to change.
Do any of the following:
Add a page to a PDF: Select the page you want to appear after the new page, choose Edit > Insert, then choose Page from File or Blank Page.
The new page is inserted before the current page.
Delete a page from a PDF: Choose View > Thumbnails or View > Contact Sheet, select the page or pages to delete, then press the Delete key on your keyboard (or choose Edit > Delete).
When you delete a page from a PDF, all the annotations on the page are removed as well.
Move pages in a PDF: Choose View > Thumbnails or View > Contact Sheet, then drag the pages to their new location.
Copy a page from one PDF to another: In each PDF, choose View > Thumbnails or View > Contact Sheet, then drag thumbnail images from one PDF to the other.
You can also create a new PDF by dragging thumbnails from a PDF sidebar to the desktop.