Password
Strength
Analyzer

Analyze password strength, entropy, and estimated crack time. Get actionable suggestions to improve your passwords.

Enter Password

Suggestions

Type a password to get strength analysis and improvement tips.

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What does "entropy" actually measure, and why do some short passwords take centuries to crack?

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Frequently Asked Questions

No. The analysis runs entirely in your browser. Your password never leaves your device — no network requests are made.

Entropy measures the randomness of a password in bits. It is calculated as length x log2(charset size). Higher entropy means more possible combinations and a harder password to crack. 60+ bits is considered good, 80+ is strong.

The estimate assumes a brute-force attack at 10 billion guesses per second (a realistic rate for modern GPU clusters). Real-world attacks may be faster if the password contains dictionary words, common patterns, or has been previously breached.