PDF Merge Tool is one of the best merger software for users who want to understand how to add pages to PDF file free online. During the merging 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 add pages to PDF file free online. 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 add pages to PDF file free online with page range option. But it allows to first 5 PDF files with CubexSoft Watermark.