Password Strength Checker
Evaluate password entropy in bits and estimate brute-force cracking resistance.
Security Checklist
How to Use the Password Strength Checker
Follow these simple steps to use this tool directly in your browser.
Type or Paste Password
Enter a test password.
Analyze Security Score
View total entropy bits and complexity checks.
Inspect Crack Time
Review estimated time required for supercomputers to crack it.
Key Features
Brute-Force Time Estimation
Calculates realistic crack duration against modern high-speed GPU clusters.
Zero Data Transmission
Tested 100% in client-side memory without ever leaving your device.
Password strength is determined primarily by entropy: the number of possible permutations a cracker must search through. Passwords longer than 15 characters containing diverse character pools require centuries to crack.
Frequently Asked Questions
Yes. The test logic runs entirely inside your browser JavaScript. No passwords are sent over the internet or logged.
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