HandBrake

I have 9 different mp4's that I'm going to combine into one 71 minute long video. This video will only be viewed online.

My questions please...

1) Should I compress the 9 videos before I combine them into one video?

2) Or should I just compress the final 71 minute long video?

3) Would the video file size get even smaller if I compressed all 9 videos before combining them into one and then also compress the final 71 minute long video?

Again, this video will only be viewed online.

Thanks very much.

It would seem to be logical, assuming you have enough space, to do all your editing/clipping/merging BEFORE you reduce the quality of the video by compressing it... Build your video, THEN compress it, so all your transitions are exactly what you expect.

3) Would the video file size get even smaller if I compressed all 9 videos before combining them into one and then also compress the final 71 minute long video?

I can imagine no possible scenario where that would be an advantage.
Your videos are already compressed.
You want as few lossy generational renders as possible . . . meaning one at most.

Got it. I will combine them first and then compress. Thanks everyone!