I like the functionality of joining two pdfs into one, selecting pages merged into each pdf.

Simple to use, user friendly, open source

PDF split and Merge or PDF Sam is a multiplatform tool built in Java that allows to solve several of the most common operations in the field of the transformation of PDF files. Intercalation / Mixing of several PDF files to create a single final document. Union of two or more PDF files (one after the other) Splitting a PDF file (in single pages) Customize the orientation of each of the pages of a PDF. Modify the orientation for all pages of a PDF. Surely you have ever found a PDF longer than a book. These files are somewhat heavy and the editor spends a lot of resources when opening them. With PDFsam you can divide them to make them more manageable. It is also possible otherwise, that you want to join several files. In all these occasions PDFsam will be the appropriate tool. The program saves the forms, the images and graphics without altering them at all when joining and dividing. In the first case, you can choose which number of pages should be cut, perform an unequal division or divide the file into equal files.