In the pop-up combine window, Open Acrobat. To start, hit the Merge PDF files. Select PDF files. Try It Free. StepOpen PDFelement. Combine PDFs in the order you want with the easiest PDF merger available. StepCombine PDF Files. Our tool above can combine two or even up toPDFs for you. Launch PDFelement. Choose File > Create > Combine Multiple Files into a single PDF. If the file is already open, then choose Combine Files from the right menu. Select multiple PDF files and merge them Note: This