Soda PDF is commercial PDF authoring software. Although there is a free trial, it does cost money, so if you have it installed without any effort or expense on your part, presumably you have the free trial.How can I combine PDF files for free?
Step 1: Download and install the Adobe Acrobat DC free trial. Step 2: Once installed, open the software and click the “Tools” tab in the top left-hand corner. Step 3: Click the “Combine Files” button. Step 4: Click the blue “Add Files” button and select the PDF documents you want to combine.