Entropy Score
0
bits
Enter a password
Character Analysis
Lowercase (a-z)
Uppercase (A-Z)
Numbers (0-9)
Symbols (!@#$...)
Length
0
Character Pool
0
Possible Combinations
0
💡 Suggestions for Improvement
⏱️ Estimated Crack Time
Online Attack (1,000/sec)
-
Offline Attack (10B/sec)
-
📚 Understanding Password Entropy
What is Entropy?
Password entropy is a measure of how unpredictable a password is, expressed in bits. The higher the entropy, the more difficult the password is to guess or crack through brute-force attacks.
How is it Calculated?
Entropy is calculated using the formula:
E = L × log₂(R)
Where L is the password length and R is the size of the character pool (total possible characters).
- Lowercase letters (a-z): 26 characters
- Uppercase letters (A-Z): 26 characters
- Numbers (0-9): 10 characters
- Symbols: ~32 characters
Entropy Strength Levels
| Bits | Strength | Description |
|---|---|---|
| 0-28 | Very Weak | Can be cracked instantly |
| 28-36 | Weak | Vulnerable to quick attacks |
| 36-60 | Fair | Provides basic protection |
| 60-128 | Strong | Good protection for most uses |
| 128+ | Very Strong | Virtually uncrackable |
Tips for Strong Passwords
- Use at least 12-16 characters
- Mix uppercase and lowercase letters
- Include numbers and special symbols
- Avoid common words and patterns
- Consider using a passphrase
- Use a unique password for each account
- Consider using a password manager