Pdf Mergy Google Drive. After that use drag and drop. Right click on one of the files.
After that use drag and drop. You can either select the files you want to merge from you computer or drop them on the app using drag and drop. I use it from google drive.
This webapp provides a simple way to merge pdf files.
Select open with and choose pdfmergy. I use it from google drive. It works quick and easy. Step 3 after the files are merged you can download it to your system or directly save it to your drive.