About the Password Strength Analyzer
Password strength is about guessability, not complexity rules. This analyzer uses zxcvbn — the estimator developed at Dropbox — which recognizes dictionary words, keyboard walks (qwerty, zxcvbn), dates, common substitutions (p@ssw0rd), and repeated patterns, then estimates how many guesses an attacker would need.
Analysis happens entirely in your browser; the password is never transmitted anywhere. Use it to sanity-check a password policy, demonstrate why "P@ssword1!" fails despite satisfying complexity rules, or compare candidate passphrases.
Frequently asked questions
Why does a password that meets complexity rules score poorly?
Because attackers know the rules too. "Winter2026!" satisfies upper/lower/digit/symbol policies but follows an extremely common pattern (word + year + symbol) that cracking tools try early. zxcvbn scores realistic guess counts, not rule compliance.
What actually makes a password strong?
Length and unpredictability. A four-word random passphrase (e.g. diceware) typically exceeds 60 bits of entropy and beats any 8-character symbol soup. The strongest option is a password manager generating 20+ random characters per site, so no password is ever reused.
Is it safe to type a real password into this tool?
The analysis runs locally in your browser with no network calls — nothing is sent to a server. That said, the standard advice applies to any strength checker: prefer testing candidate patterns rather than the exact production password you already use.
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