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hPassword › Password Strength Checker

Password Strength Checker

Real-time analysis of any password - entropy score, crack time estimation, character composition breakdown, and actionable improvement tips. Runs 100% locally in your browser.

Overall Strength-
Security Requirements
At least 12 characters
Contains uppercase letters (A-Z)
Contains lowercase letters (a-z)
Contains numbers (0-9)
Contains symbols (!@#$...)
Not a commonly known password
No excessive repeated characters
-
Estimated crack time at 10 billion guesses / second
Score Analysis
0 / 100
-Entropy bits
-Length
-Unique chars
-Charset size
Character Breakdown
Enter a password above...
Uppercase0%
Lowercase0%
Numbers0%
Symbols0%
Suggestions
Enter a password to see improvement suggestions...
How Does Password Strength Work?

Password strength is determined by entropy - a measure of unpredictability. The formula is: entropy = log2(charset^length). Using 94 ASCII characters at 16 characters long yields 100+ bits of entropy - practically unbreakable by brute force.

The crack time estimate assumes a GPU cluster at 10 billion guesses per second. A properly generated 16-character password would take longer than the age of the universe to crack.

Our checker screens against commonly used passwords, detects repeated patterns, and evaluates character diversity. The 0-100 score combines all factors into a single easy-to-understand rating.