[Windows
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]For basic merging on Windows, you can use built-in features to save the documents together.Open a blank document in Microsoft Word.Go to the Insert tab, click Object, and select Text from File.Select all the PDF files you want to combine (hold Ctrl to select multiple) and click Insert.Go to File > Save As and choose PDF as the file format.
[Mac]Macs have a built-in tool that merges PDFs seamlessly without the internet.Open one of your PDFs in the Preview app.Go to View > Thumbnails to open the sidebar.Drag and drop the other PDF files directly into the thumbnail sidebar.Arrange the pages in the order you want, then go to File > Export as PDF.