You can find many online applications to merge two pdf files into one pdf, but I would suggest you try the Softaken PDF Merge Tool. In this program, you can merge multiple pdf files into one single pdf with just a few clicks. In this process, your data integrity is maintained, and there is no change in data content or formatting. This program allows you to merge password-protected files in a very quick and simple way. You can easily merge files with restrictions like copy, edit, and print. This program has a user-friendly interface and an easy-to-use features. Any person can use it without having technical knowledge. This application runs on all Windows operating systems like 10, 8, 8.1, 7 and others. You can also try the free version to see how this application works. This PDF Merge tool helps you to merge pdf files very safely.