Password Strength Checker

The Password Strength Checker analyzes password security using multiple criteria including length, character variety, entropy calculation, and pattern detection. Get detailed feedback and suggestions to create stronger, more secure passwords.

Key Features:

• Real-time Analysis: Instant feedback as you type
• Comprehensive Scoring: Multi-factor strength assessment
• Entropy Calculation: Mathematical measure of password randomness
• Crack Time Estimation: Estimated time to break the password
• Pattern Detection: Identifies common weak patterns
• Detailed Feedback: Specific suggestions for improvement
• Privacy Focused: All analysis happens locally in your browser

Strength Criteria:

• Length: Minimum 8 characters, recommended 12+ characters
• Character Variety: Mix of uppercase, lowercase, numbers, symbols
• Uniqueness: Avoid common passwords and predictable patterns
• Randomness: Higher entropy indicates better security
• No Patterns: Avoid keyboard patterns, sequences, repetition

Security Levels:

• Very Strong (90-100): Excellent security, very long crack time
• Strong (75-89): Good security for most purposes
• Good (60-74): Adequate security, room for improvement
• Fair (40-59): Basic security, should be strengthened
• Weak (20-39): Poor security, vulnerable to attacks
• Very Weak (0-19): Extremely vulnerable, change immediately

Common Weaknesses:

• Dictionary Words: Common words are easily cracked
• Personal Information: Names, dates, addresses are predictable
• Simple Patterns: 123456, qwerty, password123
• Keyboard Patterns: Sequential keys like asdf or 1234
• Repeated Characters: aaa, 111, etc.
• Short Length: Under 8 characters are vulnerable

Best Practices:

• Use at least 12 characters for important accounts
• Include uppercase, lowercase, numbers, and symbols
• Avoid personal information and dictionary words
• Use unique passwords for each account
• Consider using a password manager
• Enable two-factor authentication when available

Password Creation Tips:

• Passphrases: Use multiple random words with separators
• Substitution: Replace letters with numbers/symbols (@ for a)
• Acronyms: Create from memorable phrases
• Random Generation: Use password generators for maximum security
• Length Over Complexity: Longer passwords are generally stronger

Security Notes:

• All password analysis happens locally in your browser
• Your password is never transmitted or stored
• Crack time estimates assume offline brute force attacks
• Real-world security depends on additional factors
• Use this tool as a guide, not absolute security guarantee