Password Strength Checker
Check password strength with entropy calculation.
How to Use
- Type or paste a password into the input field to analyze its strength.
- Review the detailed analysis: entropy score (bits), strength level, character set diversity (lowercase, uppercase, numbers, symbols), and length assessment.
- Use the improvement suggestions to strengthen your password — add more characters, mix character types, and avoid common patterns.
Frequently Asked Questions
- How is password strength calculated?
- Based on Shannon entropy — length × log2(character set size). Higher entropy means more possible combinations and longer crack times.
- What is a good entropy score?
- Aim for 60+ bits for general accounts, 80+ for sensitive accounts, and 100+ for critical systems like banking or admin access.
- Is my password sent anywhere?
- No. The analysis runs entirely in your browser. Your password never leaves your device.