Password Strength Checker
Test password entropy, crack time estimation, dictionary vulnerability, and NIST 800-63B compliance.
How to Use Password Strength Checker
Type or paste a password into the test field.
Inspect the live score, entropy bits, character variety, and brute-force time estimate.
Review recommendations to eliminate vulnerabilities.
Password Strength Checker runs 100% client-side in your web browser. Your data, passwords, keys, and files are processed using the Web Crypto API and never transmitted to any server. Zero telemetry, zero storage, zero cloud processing.
Frequently Asked Questions
Is it safe to test my real password here?
Yes! Testing is performed 100% client-side in your web browser using JavaScript. No passwords are ever transmitted or saved.
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