merge pdfs into one

At work, the PDF file that everyone comes into contact with most should be pdf. PDF is convenient for daily browsing and reading. It is neatly typed, not easy to mess up, and easy to print. However, it also has a disadvantage that it cannot be edited, but this shortcoming has brought us a lot of tro

Now people's work is more and more difficult, and the content of work is also more and more. Sometimes I receive a PDF from a leader or a colleague and don't know how to combine multiple PDFs into one, and some PDFs are even as high as hundreds of megabytes or gigabytes, so how to merge such a large