There’s also a rotate toolbar at the top of the Preview window: If a PDF is the wrong way round, you can also rotate it by selecting the page and then selecting “Tools” in the in the Toolbar at the top of the screen and then selecting “Rotate Left” or “Rotate Right”. If you want to split a PDF on your Mac or extract specific pages, simply drag the thumbnails to your Mac desktop and they will be saved as separate PDF documents.
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You can also delete pages by selecting them and pressing the “Delete” or “Backspace” key on your keyboard. Once your pages are merged or combined, you can easily change their order by dragging and dropping them in Preview. The page numbers will automatically number themselves once you’ve dragged them in. That’s it – you’ve joined multiple PDFs into one document.
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If you find that the PDF keeps opening in another application instead of Preview, Ctrl-click on the PDF file and select “Open With” from the menu and select Preview: If you’ve got lots of PDF files that you want to join, this will mean you have a lot of Preview windows open on your desktop so try and keep them organized.