Password Strength Checker
Analyze the complexity, crack time, and strength of your passwords against standard attacks.
Why Test Your Password Strength?
Modern cyber attacks use sophisticated dictionaries, leaked password databases, and massive computing power to guess passwords in milliseconds. Checking your password strength is a vital defensive step to ensure your protective measures aren't easily bypassed.
Our Password Strength Checker leverages massive internal dictionaries and pattern matching to gauge exactly how resilient your password is. It evaluates length, character variety, common substitutions, pattern repetition, and whether your password incorporates common dictionary words.
Understanding Password Entropy
Entropy is a measure of password unpredictability. While length adds entropy quickly, predictability drastically lowers it. A password like "Password123!" might meet complexity requirements (capital, number, symbol), but it has extremely low entropy because it is highly predictable. A phrase like "correct horse battery staple", despite lacking symbols, can have higher entropy due to its length and uniqueness.
Security Note: This tool performs all evaluations locally in your browser. The password you type is never transmitted over the network or saved.