Thanks a bunch! I was able to get rid of a lot of very old labels I had in my gmail account.

This is ABSOLUTELY fantastic!! I have nearly 1000 labels and screwed them all up by changing the top level label names, which Google then decided meant all the underlying ones should no longer be nested. It would have taken me DAYS to fix this but it only took a few minutes using this tool, which is now going to be my core label manager. I am in awe of the fact people like Goldy are willing to put so much time and energy into building an app like this and then putting together a series of videos to make it easy to use. Thank you Goldy!!