How to merge PDF files from the web, desktop, and command line
Briefly

Merging PDF documents can be complex, as PDFs contain multiple layers, and traditional methods of copying files may not preserve their integrity.
Web-based PDF combiners, such as Adobe's PDF Combiner, are convenient, requiring just a drag-and-drop action, but raise concerns about data privacy.
Desktop applications, like PDF Merger & Splitter and MacOS Finder, allow users to merge PDFs without internet-related privacy concerns, offering an alternative merging solution.
Whether using web-based tools or desktop applications, understanding the process of merging PDFs is essential for preserving the document's original quality and structure.
Read at ZDNET
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