Password Strength Checker
Analyze your password strength by calculating entropy and brute-force crack time.
How it works
Enter a password to instantly analyze its security. The tool checks complexity requirements, calculates entropy bits, and estimates the brute-force crack time.
Frequently asked questions
What makes a password truly strong?
Strength depends mainly on length and unpredictability. A longer password (12 to 16+ characters) is generally far more secure than a short one with complex characters.
What is entropy in a password?
Entropy measures the unpredictability of a password. Each bit of entropy doubles the attempts needed to guess it, making it exponentially harder to crack.
How is the brute-force crack time estimated?
It is calculated assuming a high-speed brute-force attack capable of 10 billion guesses per second. Short passwords crack instantly, while long, complex passwords take centuries.