🛠️Developer
🔐
Password Strength Tester
Developer

🔒 Security Tips

  • • Use a different password for every account
  • • Use a password manager (Bitwarden, 1Password)
  • • Enable two-factor authentication (2FA)
  • • Check breaches at haveibeenpwned.com
  • • This tool analyzes passwords locally
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Enter a password to analyze its strength
Data Source & Legal Disclaimer
Effective: Analysis methods — no expiration
Last updated: 2 weeks ago
Update frequency: Manual review
Sources: NIST SP 800-63B — Digital Identity Guidelines · Have I Been Pwned — Breach Database

Password analysis is done entirely in your browser. No data is sent to any server. Entropy calculation and crack time estimates are approximations. Always use unique, strong passwords and enable 2FA.

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About This Tool

Test your password strength with this free advanced analyzer. Calculates entropy (bits), estimates crack time against modern GPUs, checks 9 quality criteria (length, uppercase, lowercase, numbers, special chars, no repeats, no sequences, not common, not dictionary), and provides actionable improvement suggestions. Also includes tips on password security and HIBP breach check guidance. Your password never leaves your browser — 100% client-side analysis. No signup required.

Entropy calcCrack time est.9 quality checks

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No paywalls, no signups, no data sold. Built by a solo developer who believes useful tools should be accessible to everyone.

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