PDFsam Basic 2.2.2 for Windows
The installer may include advertisement offers to finance further development, read here why.
PDFsam basic is a completely free, platform independent software designed to split and merge pdf files. It’s stable, open source and It should cover most of your needs.
PDFsam Enhanced 2.2.2e
To get the enhanced version you need a forum account (register here) and donate at least 1€ here. Once the donation is made, you’ll be able to download PDFsam enhanced (current and future versions).
Please read here for more details.
Other platforms or versions
All the available downloads for the supported platforms (MacOS, Linux..), the source code, the MSI installers and the Zip bundle can be found here.
Command Line Interface
If you are planning to split and merge pdf documents from command line you should download the latest version of sejda-console. Sejda is the project where all the pdf manipulation logic has been moved, where we are putting our efforts and it will soon become the core library for PDFsam.