The basic free version has all the capabilities that I need! It lets me split and merge PDFs in addition to other things. All I need to do is to drop the PDFs, reorder them, and select merge. It also has an option to normalize the sizes of pages so that the merged file has a consistent page size throughout the document. Splitting PDFs is equally easy! Just select the file and set how you want it to be separated; like each page or after a specific page. And of course you can opt in to pay a fee and use the enhanced version which has more capabilities but for my basic needs, the free version is more than enough.

PDFsam is a straightforward, easy to use PDF tool that is used for merging, splitting, and extracting PDFs and its pages. It has a drag and drop interface with plenty of options. I only have a PDF reader installed but occassionally need some of these tools that readers simply do not have. PDFsam allows me to modify my PDFs without having to purchase more software.

It is easy to use and had multiple options (merge, split, etc.)