Password Strength & Entropy Checker
Test how resilient your password is against brute-force attacks. Calculates Shannon entropy in bits, checks for common dictionary patterns and character diversity, and estimates cracking time across supercomputers and consumer hardware.
About Password Strength & Entropy Checker
Test how resilient your password is against brute-force attacks. Calculates Shannon entropy in bits, checks for common dictionary patterns and character diversity, and estimates cracking time across supercomputers and consumer hardware.
Primary Purpose: Test password strength and calculate entropy in bits
How to Use the Password Strength & Entropy Checker
- 1Type or paste a test password.
- 2The entropy meter evaluates character pool size and length.
- 3View estimated time to crack and actionable security recommendations.
Understanding Password Entropy: How Length Beats Complexity
Why a 16-character passphrase is vastly more secure than an 8-character password with random symbols.
Frequently Asked Questions
Is it safe to type my password into this checker?
Yes! The checker executes entirely via client-side JavaScript in your browser. You can even disconnect your internet while testing.
What is a good entropy score in bits?
60+ bits provides good defense against online brute-force attacks; 80+ bits provides military-grade resilience against offline GPU clusters.