The "sam" in PDFsam stands for Split and Merge. This open-source tool is perfect for users who want a clean, no-nonsense interface.
Windows, Mac, Linux Type: Offline (Full Office Suite) freeware to merge pdf files
When you're in a hurry and don't want to install software, browser-based tools are incredibly convenient. Just be mindful that you are uploading your files to a remote server. 1. ILovePDF The "sam" in PDFsam stands for Split and Merge