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That's surprising. Isn't that a quite famous service? Is there a service implemented using only clientside js without sending?

famous? not sure about that, but they have the best SEO so it's always the goto.

There is sort of a file sharing community in Korea, and it is customary to encode links in base64 there.

I'm not really sure why they do that. It's not even a tech-related community. Anyway, they tell you to use base64encode.org.