Security
Password Strength Tester
Test and analyze the strength of any password with entropy calculation and detailed feedback.
All password analysis happens locally in your browser. Your passwords are never sent to any server.
Entropy measures password randomness. Higher entropy = stronger password.
Documentation
How to Use
1
Enter a Password
Type or paste the password you want to test. Use the eye icon to toggle visibility.
2
View Analysis
See instant feedback including strength score, entropy, and estimated crack time.
3
Check Character Types
Review which character types (lowercase, uppercase, numbers, special) are included.
4
Read Suggestions
Get specific recommendations to improve password strength.
5
Generate Strong Password
Click 'Generate Strong' for a cryptographically secure 16-character password.
Pro Tips
Use 12+ characters with mixed types
Avoid dictionary words and patterns
Examples
Input
password123
Output
Weak - low entropy, common pattern