Password Strength Analyzer Detailed Security Statistics
Get comprehensive password analysis with entropy calculations, character analysis, and time-to-crack estimates. Your password never leaves your device - all analysis happens locally.
Analyze Your Password Strength
Comprehensive Password Analysis
Overall Strength
Combines length, character diversity, entropy, and pattern avoidance.
• 0-20: Very Weak
• 21-40: Weak
• 41-60: Medium
• 61-80: Strong
• 81-100: Very Strong
Entropy
Measures randomness and unpredictability of your password.
• 0-20: Very Low (easily guessable)
• 21-40: Low (weak)
• 41-60: Medium (moderate)
• 61-80: High (strong)
• 80+: Very High (excellent)
Higher entropy = exponentially harder to crack
Time to Crack
Realistic time estimates for different attack scenarios.
🔥 Online Attack: Direct login attempts
⚠️ Offline Fast: Stolen hash cracking
🛡️ Advanced: Nation-state resources
⚛️ Quantum: Future quantum computers
Based on 2025 hardware capabilities
Strength Recommendations
Prioritized recommendations to strengthen your password based on detailed analysis.
High Priority: Critical security improvements
Medium Priority: Important enhancements
Low Priority: Minor optimizations
Each recommendation includes the expected security impact
Character Composition
Shows the count of each character type in your password.
Lowercase: a-z (26 characters)
Uppercase: A-Z (26 characters)
Numbers: 0-9 (10 characters)
Symbols: !@#$%^&* etc. (32+ characters)
More character types = higher entropy
Character Distribution
Visual breakdown of character types in your password.
Green: Lowercase letters
Blue: Uppercase letters
Orange: Numbers
Red: Special characters
Balanced distribution = better security
Advanced Analysis
Detailed analysis of password vulnerabilities and characteristics.
Pattern Detection: Identifies predictable patterns
Common Password Check: Checks against known weak passwords
Character Set Size: Number of unique characters used
Estimated Guesses: Total possible combinations
These metrics help identify specific weaknesses
Pattern Detection
Common Password Check
Character Set Size
Estimated Guesses
Understanding Password Security
How Password Strength is Measured
Password strength is determined by several key factors working together to create a comprehensive security assessment.
Entropy: The Foundation of Security
Entropy measures the randomness and unpredictability of your password. It's calculated using Shannon's entropy formula, which considers the size of the character set used and the length of the password. Higher entropy means more possible combinations, making your password exponentially harder to crack.
Character Diversity Matters
Using a mix of lowercase letters, uppercase letters, numbers, and special characters significantly increases your password's strength. Each additional character type multiplies the possible combinations, making brute force attacks much more time-consuming.
Length vs. Complexity
While both length and complexity are important, length often provides better security. A longer password with simple characters can be more secure than a short, complex one. However, the ideal approach combines both length and character diversity for maximum protection.
Understanding Security Metrics
Time-to-Crack Estimates
Our time-to-crack calculations consider different attack scenarios to give you realistic security assessments. Online attacks (1,000 guesses/second) represent typical web-based attempts, while offline attacks (1 billion guesses/second) represent sophisticated hardware-based cracking attempts.
Attack Scenarios Explained
- Online Attack: Attempts made through web interfaces with rate limiting
- Offline Fast: High-speed hardware attacks on stolen password databases
- Offline Slow: Slower but more thorough cracking attempts
Why These Metrics Matter
Understanding these metrics helps you make informed decisions about password security. A password that takes years to crack offline provides excellent protection against most threats, while one that cracks instantly needs immediate improvement.
Password Security Best Practices
Creating Strong Passwords
- ✓ Use at least 12 characters
- ✓ Include uppercase and lowercase letters
- ✓ Add numbers and special characters
- ✓ Avoid common words and patterns
- ✓ Use unique passwords for each account
What to Avoid
- ✗ Personal information (names, birthdays)
- ✗ Sequential characters (123, abc)
- ✗ Common words or phrases
- ✗ Reusing passwords across sites
- ✗ Simple substitutions (a→@, e→3)
Frequently Asked Questions
Is my password safe when I use this analyzer?
Absolutely! Your password never leaves your device. All analysis is performed locally in your browser using JavaScript. We don't store, transmit, or have access to your passwords in any way.
How accurate are the time-to-crack estimates?
Our estimates are based on realistic attack scenarios and current computing capabilities. However, actual cracking times can vary based on the attacker's resources, password hashing algorithms, and other factors. These estimates provide a good relative measure of password strength.
What is entropy and why does it matter?
Entropy measures the randomness and unpredictability of your password. Higher entropy means more possible combinations, making your password exponentially harder to crack. It's calculated using Shannon's entropy formula, which considers both the character set size and password length.
Should I change my password if it gets a low score?
Yes, especially for important accounts like email, banking, or work systems. A low score indicates your password could be cracked quickly. Use our suggestions to create a stronger password that combines length, character diversity, and avoids common patterns.
How often should I check my password strength?
Check your password strength whenever you create a new account or change an existing password. Also consider checking periodically, especially if you've been using the same password for a long time or if you suspect it might have been compromised.