Strong Password Generator
Generate strong random passwords with customizable character rules.
Open Strong Password Generator
Password Strength Checker
Analyze password strength with scoring, entropy estimate, breach-risk heuristics, and improvement suggestions.
Strength score
0/100
Very Weak
Entropy estimate
0.0 bits
Estimated from length and detected character pool.
Breach-risk heuristics
Not evaluatedAdd a password to evaluate client-side pattern risks.
Improvement suggestions
- Enter a password to get a strength analysis.
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Frequently asked questions
Common questions about this tool.
The checker combines estimated entropy, length, character variety, and client-side pattern penalties into a 0-100 score.
Entropy is a rough estimate of guessing difficulty measured in bits, based on password length and the detected character pool size.
No. This tool uses local heuristics only and does not query remote breach APIs. It flags common patterns linked to frequently compromised passwords.
No. Analysis runs locally in your browser.
No single score guarantees security. Use unique passwords per site, store them in a password manager, and enable MFA for important accounts.