Generated on your device
Passwords are created in your browser with the Web Crypto API’s secure random number generator. They are never sent to a server or saved.
How long should a password be?
For most accounts, 16 characters or more with letters, numbers, and symbols is strong. Use a password manager so every account gets its own unique password.
About the strength estimate
Strength is measured in bits of entropy, based on the number of possible characters and the length. Each extra bit doubles the number of guesses needed, and 80 bits or more is very strong against guessing.