Is it safe to test my password on this website? (because I just did)
"It goes without saying (although I say it anyway on that page), but don't enter a password you currently use into any third-party service like this! I don't explicitly log them and I'm a trustworthy guy but yeah, don't."
Safe: probably. Good practice: no.
Well, I better get prepped to fight the Estatis Inc. Retaliatory Creature to retain full ownership of my soul. Thanks for the heads up.
It is much, much safer to download the data and search for your passwords from inside the local copy of the data, and that's exactly what I'm gonna do later tonight.