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Cryptography

Password Strength & Entropy Analyzer

Calculate password entropy bits, brute-force crack time estimates, and complexity scores.

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How to Use Password Strength & Entropy Analyzer

  1. Type any password or passphrase into the input field.
  2. Review the real-time entropy bits and estimated crack time.
  3. Use the checklist to verify uppercase, lowercase, numbers, and symbols.

Frequently Asked Questions

What is password entropy?

Password entropy is a mathematical measure (in bits) of unpredictable information based on character set size and password length.

Is my password safe to type here?

Yes. Analysis is computed 100% locally in your browser using pure JavaScript and never transmitted over the internet.

Sources & References

Primary references: NIST SP 800-63B: Authentication and Authenticator Management; W3C Web Cryptography API.

Review policy: references and behavior notes are checked whenever the tool implementation changes.