PDF Merge Tool is one of the best merger software for users who want to learn how to join several PDF files into PDF file format. During the combing process, it maintains folder hierarchy and structure of PDF file to effortlessly manage the complete information. Batch mode is also provided by PDF combine tool. All Windows OS editions are well suited to learn how to join several PDF files into PDF format. Free download version of this tool is also given by this software for users so that they to easily understand the working process of how to join several PDF files into PDF with page range option. But it allows to first 5 PDF files with CubexSoft Watermark.