Password Strength Tester
ENTROPY ANALYSIS · CRACK TIME ESTIMATE · SECURE GENERATOR
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Analysis
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BITS OF ENTROPY
Password Length
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Character Pool
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Combinations
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Time to Crack
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Lowercase (a-z)
Uppercase (A-Z)
Numbers (0-9)
Symbols (!@#$...)
12+ characters
What is entropy?
PASSWORD ENTROPY EXPLAINED
Entropy measures password unpredictability in bits — higher is better. It's based on character set size and length.
- < 28 bits — Very weak · crackable instantly
- 28–50 bits — Weak to fair · vulnerable to attacks
- 50–60 bits — Moderate · low-security only
- 60–80 bits — Strong · recommended for most accounts
- 80+ bits — Very strong · excellent protection
- 100+ bits — Exceptional · maximum security
Entropy = Password Length × log₂(Character Pool Size)