If “Page from File” is greyed out on Step 4, make sure that the opened file is a PDF.
Click File > Export as PDF to save the merged PDF files. Click Edit > Insert > Page from File, choose the PDF that you want to add, then click Open. Select a page thumbnail to indicate where you want to insert the other PDF.
Choose View > Thumbnails to show page thumbnails in the sidebar. No matter which kind of MacBook or iMac on recent OS you use, please follow steps below to merge PDF files on Mac computer. The Preview app on MacOS is built with a feature for this purpose. The thing is very simple when it comes to merging PDF files on Mac. The question here is, how to merge two PDF files in one? Or, furtherly, how to combine parts of several PDF documents? In this tutorial, you will learn easy and free solutions to merge PDF files on Windows 10/8/7 as well as Mac computer. PDF documents are very common and usually formal for both work and personal affairs, but in many cases, people need to combine the content of two or more PDF files. How to Merge PDF Files Free on Mac and Windows 10/8/7