How to merge PDF files for free (Mac and Windows)

Combining PDF files can be easily accomplished using built-in tools on both Mac and Windows systems, as well as through online services. On a Mac, users can utilize the Preview app or Finder to merge PDFs by organizing and dragging pages within a document. Windows users, lacking a native PDF merging tool, can turn to third-party applications like PDF Merger & Splitter available on the Microsoft Store, which allows for file rearrangement and merging. Alternatively, online tools such as Adobe Acrobat and ilovePDF provide cross-platform solutions where users can upload, reorder, and merge files directly in a web browser. For those seeking automation, Zapier offers integrations that can streamline the process based on specific actions, such as adding new files to a designated folder.