Password Strength Test
Test your password strength instantly. Our free tool analyzes entropy, crack time, and character variety to rate your password security.
Testing your password strength is the first step toward better online security. Our password strength test tool analyzes your password locally in your browser, examining its length, entropy, character diversity, and estimated brute-force crack time. No data is ever sent to any server, ensuring complete privacy. Whether you are creating a new account or updating existing credentials, this tool gives you instant, actionable feedback on how secure your password really is. Understanding password strength helps you make informed decisions about your digital security posture.
How to Use This Tool
- 1. Enter your password in the input field
- 2. View the real-time strength meter and score
- 3. Check the entropy value and estimated crack time
- 4. Review which character categories are used
- 5. Adjust your password until you reach a strong rating
Why Use This Tool
- Instant local analysis with zero data transmission
- Detailed entropy calculation in bits
- Realistic brute-force crack time estimation
- Character category breakdown for improvement guidance
- Works completely offline after page load
Frequently Asked Questions
Is my password sent to any server?
No. All analysis happens locally in your browser. Your password never leaves your device.
How is password entropy calculated?
Entropy is calculated as password length multiplied by log2 of the character pool size. A larger pool (mixing uppercase, lowercase, digits, symbols) increases entropy.
What is a good entropy score?
An entropy of 60+ bits is considered strong. Above 80 bits is very strong and would take centuries to crack with current technology.
How accurate is the crack time estimate?
The estimate assumes 10 billion guesses per second, which represents a powerful attack setup. Real-world times may vary based on the attacker resources.