Password Strength Checker

Check password entropy and crack time. Generate strong secure passwords.

Generate password

How to Use

  1. Type a password to check strength, or use the generator.
  2. Review entropy, crack time, and strength meter.
  3. Copy a generated password securely.

Password entropy

Entropy (bits) = Length × log₂(Character pool size). Longer passwords with mixed character types resist brute-force attacks far better than short complex ones.

Frequently Asked Questions

How is crack time estimated?
Based on password entropy (character set size^length) and an assumed 10 billion guesses per second.
What makes a strong password?
Length matters most. Mix uppercase, lowercase, numbers, and symbols for higher entropy.

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