Password Entropy Calculator
Estimate a password's strength in bits of entropy based on its length and character set, with a rough crack-time estimate.
Your file is processed locally in your browser and is not uploaded to our server.
Result
Your result will appear here.
How to use Password Entropy Calculator
- 1Type a password to evaluate (nothing is sent anywhere).
- 2See its estimated entropy in bits, and a rough offline-guessing time estimate.
Frequently asked questions
No — the calculation happens entirely in your browser as you type, and nothing is transmitted or saved.
It assumes a fast offline attack of 10 billion guesses per second against the full character-set space — a rough estimate, not a guarantee.
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