We often have too many PDF documents or sheets to handle with, such as report, statistics, brochure etc. In order to achieve batch printing, batch emailing or batch archiving for easier organzation, we may need to merge some PDF files into a single file. How to merge PDF files? 1. Start PDF Merger 2. Import PDF files and images 3. Set merging way for each PDF 4. Customize settings 5. Merge all the PDF files Follow these steps, you'll easily merge multiple PDF files into a single document in seconds.