If you want to get ride of certain pages from your PDF file, such as ads content or blank pages, you can use Preview app or professional PDF editor, notably Adobe Acrobat. Refer to this tutorial to remove pages from PDF using Preview on Mac. Adobe Acrobat is one of the most popular and trusted PDF applications. Acrobat Pro is the most comprehensive PDF solution with full convert and edit capabilities, advanced protection, e-signature and more features. It allows you to select and remove any pages in a PDF file without affecting the rest pages. And it can get this job done in just seconds. Note that you need to purchase the premium version of Adobe Acrobat, not the free Acrobat Reader.
Delete pages from PDF using Acrobat
Launch Adobe Acrobat Pro from the Launchpad on your Mac. Click File > Open. Navigate to the folder where the PDF file you want to edit resides and import it to the editor program on your Mac. Click to expand the left sidebar in Acrobat and choose the Page Thumbnail. You can also access it from View > Show/Hide > Navigation Panes > Page Thumbnails. Click to select a page thumbnail in the left sidebar, click the Delete button at the top toolbar in the Page Thumbnails view.
You can use Shift or Command key to select multiple pages to delete. You will get a warning about the action. Click OK button to delete the pages from the PDF file. Finally click File > Save As to export the PDF as a new file from Adobe Acrobat to your Mac.