How to Use the Password Strength Checker
The Password Strength Checker analyzes a password's length along with whether it contains lowercase letters, uppercase letters, digits, and special characters, then scores its security strength from 0 to 100. Longer passwords and a wider mix of character types push the score higher, and the result is grouped into one of four ratings: Weak, Fair, Strong, or Very Strong. It also estimates how long a brute-force attack would take based on the number of possible character combinations, assuming 10 billion guesses per second, giving you a concrete sense of how safe the password really is.
Use it to check whether a new password you're creating meets a reasonable bar, or to see how vulnerable an old password might be. Whatever you type is never sent to a server — everything is calculated instantly in your browser and nothing is stored anywhere, so you can check freely. The most effective way to raise the score is to make the password at least 12 characters long and mix uppercase, lowercase, digits, and special characters together.
Frequently Asked Questions
No. Your password is calculated entirely in your browser and is never sent anywhere or stored.
A score from 0 to 100 is calculated based on password length and whether it includes lowercase letters, uppercase letters, digits, and special characters.
It's a rough estimate based on the number of possible character combinations, assuming 10 billion guesses per second. Actual attack conditions vary.