Password strength checker

Password Strength Checker — Evaluate Password Security Online

Analyze your password strength instantly and get detailed feedback on security vulnerabilities. Our password strength checker evaluates entropy, character diversity, length, and common pattern weaknesses to give you a comprehensive security score. Test passwords against dictionary attacks, keyboard walks, and predictable substitutions before deployment.

Password Strength Analysis Criteria

• Password length and character count evaluation
• Character set diversity (uppercase, lowercase, digits, symbols)
• Common dictionary word and pattern detection
• Keyboard walk detection (qwerty, 12345)
• Repetition and sequential character analysis
• Estimated crack time under various attack scenarios
• NIST and OWASP compliance guidance

Weak passwords are a leading cause of account compromise and data breaches. Use this checker to validate password policies, educate users on creating stronger passwords, and test your authentication forms. The tool provides entropy calculations and estimated crack times for GPU-based attacks without transmitting your password to any server — all analysis runs locally in your browser for complete privacy.