Do you have multiple PDF files and need to merge them into a single file? Are you a Mac user? Then this is a very simple task for which you don’t need to use any third-party software. From the Preview app included in all versions of macOS you can easily combine or merge PDFs .
Preview is an app that looks very simple, but actually hides a lot of functions and you can take advantage of it to perform many kinds of tasks like resizing images, cropping photos or merging several PDFs into one as you will see below.
The steps to unify several PDF files into one using Preview on Mac are as follows:
1.- Open the first PDF file with Preview. Unless you have some specialized software installed you only have to double click on the file.
Click on the menu Display and activate the option Thumbnails if it is not already.
Select the other PDF files you want to merge into a single file and drag them to the end of the sidebar (this step can be done by selecting all the files you want to merge or dragging them one by one).
4.- Click on File and select Export as PDF if you want to generate a new file containing all or Save if you prefer to overwrite the file opened in point 1 with the contents of all the PDFs combined.
During the joining process of several PDFs you may also want to change the order of the pages that make up the PDF . To do this, simply click on the page or pages you want to move in the sidebar and drag them to the position you want them to be.
As you can see the process of merging several PDFs into one is very simple in Preview and it will only take you a few seconds to do it.
Of course there are other more advanced options for this type of task such as PDF Expert, although in many cases the options offered by Preview will be more than sufficient