At first, I assume that your videos need to convert to other video formats, then we can operate as following steps:
Step 1. Are you ready? Oh, Before going on reading, I suggest you to check out whether the editing program to merge two video files or more has been installed correctly. If so, then run the program and a window will open, its screenshot as follow:

Step 2. There are mainly two ways to import your video files.
1. Find the "Add Files" icon and directly click it;
2. Up to the main interface, then click the option in turn "File" -> "Add Files" / "Load Files form Device" / "Add Folder".
By the way, this program enables you to import multiple video files at one time if you need to merge more than two video files.
Step 3. It's time to select a proper output format for merging video files. Click the small "Output Formats" image button and go on clicking "Common video" -> "MP4". It's just an example, you can also select any other video format as you like, too.
For more settings, please click the gear image button to set video/audio advanced values, including encoder, resolution, frame rate, etc., just according to your own needs.

Step 4. Everting is OK? Make sure the "Merge into One File" at the bottom on the left interface is cheched, then you can click the "Start" button to start conversion and merging video files into one file.
Oh, can't wait to have a try? That is also what, and so on, free downloading this program to merge video files quickly!
