After searching over the internet I found an amazing utility to combine pdf files into one and to perform multiple other PDF operations such as split, lock, unlock, and convert PDF files. The name of this professional utility is PDF Manager Tool. This
software can split large-sized PDF documents into many files. Moreover, this utility can merge different PDF files into one. It also provides password protection to PDF files and can also unlock PDF documents. This software can also convert PDF file into
several formats like PNG, JPEG, BMP, and GIF. For more information:
https://www.convertertools.org/pdf-manager/
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