Start typing to see real-time strength analysis
Password strength analysis goes beyond simple length and character-type checks. Sophisticated strength estimators model the patterns that attackers actually exploit: dictionary words, keyboard walks, common substitutions (@ for "a"), repeated characters, and sequential numbers. Understanding your password's estimated crack time against real-world attack benchmarks lets you make an informed decision about whether it is adequate protection for the account it guards.
The checker calculates entropy based on the detected character pool: lowercase (26), uppercase (52), digits (62), symbols (95 printable ASCII characters). It then scans the password for common structural weaknesses — dictionary words, keyboard patterns, leet-speak substitutions, and repeated character runs — and applies a penalty to the entropy estimate for each weakness found.
Crack time is estimated for two threat models: online attacks (throttled at 100 attempts/second, representing a rate-limited login endpoint) and offline GPU attacks (10 billion attempts/second, representing a leaked hash cracked locally). Entropy is mapped to crack time as 2^entropy ÷ attack_speed.
The security checklist shows exactly which criteria pass or fail: minimum length, character variety, absence of common patterns, and absence of known-compromised passwords from common breach lists.
A company IT administrator testing the strength of a proposed new employee password policy before rolling it out to 500 users.
A developer evaluating whether the password their users are likely to choose — based on observed patterns in other breach datasets — meets a minimum security bar for their application.
A student learning cybersecurity concepts who wants to see concretely why "P@ssw0rd" scores weak despite meeting typical complexity requirements.
A personal user auditing their existing passwords by checking each one to identify which accounts have dangerously weak credentials before switching to a password manager.
Scope note: This checker estimates strength based on structure and entropy — it does not query Have I Been Pwned or any breach database, so a password might score "strong" structurally while being present in a known breach list. For comprehensive checks, use a password manager that integrates breach database lookups.
Type or paste your password in the input field
See real-time strength analysis and crack time estimates
Review the security checklist to understand weaknesses
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