Password Entropy Checker
Analyze password strength with entropy calculation, crack time estimates, and improvement suggestions.
Enter Password
💡 Definition
Password Entropy
- Entropy measures password randomness in bits.
- Higher entropy = harder to crack.
- A password's entropy depends on its length and character set diversity.
📖 How to use
Step by Step
- Type a password in the input field
- Entropy, crack time, and strength appear instantly
- Green = strong, yellow = moderate, red = weak
- Improvement tips shown below
🎯 Use cases
When to use
- Testing password strength before use
- Comparing password policies
- Security awareness training
- Understanding what makes passwords strong
Frequently Asked Questions
What is good entropy?▾
Below 40 bits is weak, 40-60 is moderate, 60-80 is strong, above 80 is very strong. A random 16-char password with mixed characters typically has 80+ bits.
How is crack time estimated?▾
Based on 10 billion guesses/second (modern GPU cluster). Actual time depends on the attack method and hardware used.