Passwords are not sent from your host machine. This article explains the process by which the passwords are checked
Website https://haveibeenpwned.com provides a way for you to check whether some of your passwords/usernames were leaked during one of the many breaches of online services. If you are like me, you have a LastPass account with way too many random passwords to check them manually. What this script does:
pip install -r requirements.txt
python have_i_though.py
and go through the interactive prompt