You can try this PDF Merger , which is an efficient PDF tool to help you combing multiple PDF files into one for better organizing, archiving and batch printing. It allows you to choose any part of pages from the selected PDF files and merge flexibly to create a new PDF file. Also you can set the properties and security for the merged PDF file.
How to combine Multiple PDF documents?
Step 1. Import PDF files
Click Add Files… on the top of the panel to import PDF files for merging. You can import up to 200 files in this program at one time.
Step 2. Choose merging method and customize output settings
Select any imported PDF file, click Method to choose the pages and order to merge. After selection, click Option to customize the Properties and Security for the merged PDF file. You can also set the File Name and Destination Folder below the panel.
Step 3. Merge PDF files
Just click the Merge button, and wait for a little while, you will get the new PDF file as you want. During the merging process, you can terminate merging the files by clicking the Stop button on the pop-up process window.