To add an image file as a page, simply drag an image file into the Thumbnail drawer.

You can repeat this with as many other PDF documents as necessary

Drag and drop the additional PDF file from the Finder into the Thumbnail drawer of Preview app to instantly add it to the PDF – this adds the dropped PDF’s into the already open PDF doc, effectively combining them.

Now go to the Mac Finder and locate the additional PDF file you want to join to the one that is already opened in Preview app.

Click on the Thumbnails button and choose “Thumbnails” to open the side drawer of PDF pages (do this even if one of the PDF files is only a single page length) – this can also be accessed from the “View” menu by choosing “Thumbnails”.

Open one of the PDF files into the Preview app of Mac OS X.

This will demonstrate combining multiple files, adding additional files, removing pages, reordering pages, and exporting as a single merged.

Combining Several PDF Files Into a Single PDF using Mac Preview That’s what we’re covering here, with a step by step guide showing you how to quickly join a variety of these docs into a single file. Perhaps best of all, you certainly don’t need to pay big extra bucks for a fancy PDF editor application when the Mac has the tools directly within Mac OS X.

Some apps make this task overly complicated, but Preview makes combining the highly portable and multi-platform pdf files incredibly simple, offering drag & drop ease.

Mac os combine pdf command line