Firstly, you can test the trial version of the PDF to image Converter tool and then ensure its advanced functions to merge pdf to image format. The tool works on every Windows OS like Windows 7, Windows 8, Windows 10, Windows XP, etc. You can load PDF files per folder by the dual options like Select File or Select Folder and also load by click the ticking option as per your need. With the help of demo mode, you can easily merge pdf to image file format in batch at one time. From this, you can enjoy to merge pdf to image for the first 5 pdf files per folder but you can convert more pdf files as you want by purchasing the licensed version of the tool.