Password check
See whether a password has appeared in known data breaches. Your password is never sent. Only the first 5 characters of its SHA-1 hash go to the Have I Been Pwned range API, which returns a list of matches that your browser checks locally.
Don't test a password you use right now unless you trust this page and your device. If it shows up in a breach, change it everywhere you use it and switch to a password manager.