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With a default PDF reader like Preview on the Mac, finding a certain word in the PDF is difficult and editing a document can be almost out of the question. Without knowing which tools to use, it will be very hard to make changes to a PDF document. Fortunately, there are plenty of PDF apps to help you get the editing job done
Microsoft Edge comes with a built-in PDF reader that lets you open your local pdf files, online pdf files, or pdf files embedded in web pages. This PDF reader gives users a single application to meet web page and PDF document needs. The Microsoft Edge PDF reader is a secure and reliable application that works across the Windows and macOS desktop platforms
If you want to customize your merger a bit more, such as by changing the order of pages or only adding in certain parts of each PDF, you'll have to split them first. Choose which individual pages or page ranges you want to pull out. You can save them as one PDF, or as individual PDFs.