Password Strength Tester

All analysis runs locally in your browser. Passwords are never stored or sent.

How it Works

PassTester will test your password for multiple common attacks and vulnerabilities. This includes brute-force, data breaches (includes dictionary), and pattern recognition.


Let's start with brute-force! We assume the worst-case scenario, as if the hacker already knows general information about the types of characters in your password. We use a mathematical formula that calculates the time it takes to guess your password based on the total password possibilities and a very fast guessing rate. This allows you to make your password almost untouchable by a brute-force attack. In other words, if your password is secure in the worst-case scenario, then it is much more safe in a real-life scenario.