Combine PDFs in Preview on Mac In Preview and open (or choose) the PDF files from the drop-down menu. · On Preview > Thumbnails > Pages, double-click “Combine PDFs”. · Use the “Join Pages” button at the bottom of the dialog to join the PDF. How to combine multiple PDF files into one at Preview · You must use the “Combine PDFs” option at the bottom of the PDF to bring together the pages. · Make sure to choose “Use Pages” when you get there. · The merge will save the merged PDF with the pages and thumbnails in the original order. Combine PDF files in Preview on Mac How to merge Adobe Acrobat PDF files from Finder Open the PDF file in Preview or Finder. · At the top-left of the PDF, choose Format > Page and print to see what the page looks like. Print with the page at the top of the page. · You can see the pages are connected. How to combine Adobe Acrobat PDF files in Preview on Mac Open the PDF file in Preview. · The combined PDF will have pages on all sides. How to combine the PDF files in OSX 10.11 El Capitan Open the PDF file in Preview. Find the section of the PDF with the words in bold. In Finder, choose Go > Go to Folder In Finder, select the PDF file that you want to combine to create your merged PDF. Click on the Add Folder link. In the Add New Folder dialog, make sure the folder is the same size as what you currently have (so all files are in the same folder, but not bigger than 10 MB). Click Add Folders. Select Add in the box next to New Folder”. Browse to and select the folder named in the PDF document. Click Ok. In the Merge PDF dialog, choose the option to add pages one by one. Click Merge All. If you need to merge all the PDFs, choose All.