Password Strength & Entropy Meter

Test password security online free with real-time entropy calculation. Estimates brute-force crack time, character diversity, and vulnerability metrics 100% locally.

How to Use Password Strength & Entropy Meter

  1. Type or paste a password into the test field.
  2. View entropy score (bits), estimated brute-force crack time, and strength level.
  3. Review character pool breakdown (lowercase, uppercase, numbers, symbols).
  4. Generate a strong, high-entropy password if needed.

Why Choose Krynn Tools for Password Strength & Entropy Meter?

  • Zero Network Transmission: Passwords are analyzed purely in local browser memory. No data is stored, logged, or transmitted.
  • Mathematical Entropy Calculation: Uses Shannon entropy formulas to evaluate true brute-force resistance.
  • Crack Time Estimation: Estimates resistance against modern multi-GPU cracking setups.

Frequently Asked Questions

Is it safe to test my real password here?

Yes, Krynn Tools runs 100% locally in your browser. However, as a cybersecurity best practice, we advise testing realistic patterns rather than active credentials.

What is a good password entropy score?

A score above 60 bits is strong for standard logins, while 80+ bits provides master-password level security against offline brute-force attacks.