Contents
- Open the PDFs that you want to combine in Preview.app
- In each document, choose View > Thumbnails to show page thumbnails in the sidebar.
- Press and hold the Command key ⌘, select the page thumbnails that you want to add to the other document, then release the key.
- Drag the selected thumbnails into the sidebar of the other PDF, then release where you want them to appear.
- Note: If you’re using macOS Sierra or earlier, drag the thumbnails directly onto a thumbnail in the other PDF.
