Does youtube video editor lower quality?

MarkC9

Junior Member
Sep 16, 2011
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I was wondering, if I mash together two uploaded clips using the Youtube video editor, will it reduce its quality?

I uploaded two different vids, 1080p @ 25000 kbit. I know Youtube downgrades the quality during the "processing" stage. When I mashed together the two clips, it initialized a "processing" stage, as it's creating a whole new video.

Will it be reducing the quality once again?