The OSTtoPSTAPP Merge PDF Tool refers to combining PDF files. The locked PDF file is quickly combined by the use of the Merge PDF App. The program can assist you in merging locked PDF files. For the needed Documents, you must enter the proper password. That is an easy and uncomplicated process. Modern PDF merging software merges files with just a few mouse clicks, saving merge processes. It supports all Windows OS versions. Before using install the free trial.