Related story: For some weird reason, I memorized the serial key for a very popular software (I must be fifteen then). Even today, I can recite the 25-letter key without a hitch. And I have used its first ten letters as a password to one of my accounts. Guess what? The password has been used 4000+ times before [1]. It's hard to digest the fact that there are at least a thousand people in the world who did the same th…
Word of warning, if you use an ad/content blocker like uBlock Origin, and block 3rd-party JS, then HIBP may give up on its k-anonymity mechanism and just sends your password to their server in cleartext. Ensure you specifically permit loading jQuery from cloudflare.com, and check network traffic using a test password first.
It seems like a huge oversight to not detect ad blockers and let the user know that their password is being transmitted in plaintext if that's true...