How can I combine or merge multiple videos into one on Windows 11?

If you want to merge videos without losing quality, use FF mpeg with stream copy.

First, put the videos in the same folder and create a text file named list.txt:

file 'video1.mp4'

file 'video2.mp4'

Then run this command:

ff mpeg -f concat -safe 0 -i list.txt -c copy output.mp4

The important part is:

-c copy

This tells FF mpeg to copy the original video and audio streams without re-encoding, so there should be no quality loss.

This only works properly if the videos have the same codec, resolution, frame rate, and audio format. If they are different, you may need to re-encode them first.