Password Entropy Calculator
NewAnalyze the entropy of any password in bits, which measures how unpredictable and resistant to brute-force attacks it is. Enter a password to see its character set size, length, entropy in bits, and estimated crack time at modern GPU speeds (100 billion guesses/second). Higher entropy means a stronger password. The tool also gives actionable recommendations to improve weak passwords. All analysis is done locally — your password is never transmitted.
Password Entropy Calculator
Measure password entropy in bits and estimate crack time at 10 billion guesses/second.
Enter a password to analyze its entropy
How to Use Password Entropy Calculator
- 1Type or paste your password
- 2View entropy in bits instantly
- 3See estimated crack time at GPU speeds
- 4Follow the recommendations to strengthen your password
Your Privacy is Protected
Password Entropy Calculator runs entirely in your browser. Your files and data are never uploaded to any server, never stored, and never shared. Everything happens locally on your device using secure browser APIs.
Frequently Asked Questions
What entropy is considered secure?
Below 40 bits: weak. 40–60 bits: moderate. 60–80 bits: strong. 80+ bits: very strong. For high-security accounts, aim for 80+ bits.
Why Use This Tool?
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