Password Strength Checker

Analyze your password security. Check strength, entropy, and estimated crack time.

Enter a password
0
Characters
0
Bits of Entropy
0
Score (0-100)

Password Criteria

At least 8 characters
Lowercase letters (a-z)
Uppercase letters (A-Z)
Numbers (0-9)
Symbols (!@#$...)
Not a common password
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Estimated time to crack (brute force)
Privacy Note: Your password is never sent to any server. All analysis happens locally in your browser.

Frequently Asked Questions

Yes! Your password never leaves your browser. All calculations happen locally on your device using JavaScript. We don't store, transmit, or log any passwords.
A strong password is at least 12 characters long, contains a mix of uppercase, lowercase, numbers, and symbols, and doesn't contain common words or patterns.
Entropy measures the randomness of a password in bits. Higher entropy means more possible combinations, making the password harder to crack. A password with 80+ bits of entropy is considered very strong.