Password Strength Checker

How Password Strength Analysis Works

Our password strength checker analyzes multiple factors to provide a comprehensive security assessment. Unlike simple checkers that only look at length, our tool evaluates entropy, character diversity, common patterns, and resistance to various attack methods.

Understanding Password Entropy

Entropy measures the randomness and unpredictability of a password, expressed in bits. Higher entropy means more possible combinations and greater resistance to brute-force attacks:

• 0-40 bits: Very weak - Can be cracked in seconds to minutes
• 40-60 bits: Weak - Vulnerable to determined attacks
• 60-80 bits: Moderate - Reasonable for most accounts
• 80-100 bits: Strong - Suitable for important accounts
• 100+ bits: Very strong - Effectively uncrackable

Time-to-Crack Estimates

Our crack time estimates are based on a hypothetical attack scenario using modern hardware capable of 10 billion guesses per second. Actual cracking times depend on many factors:

• Attack method: Brute-force vs. dictionary attacks
• Hardware used: CPU vs. GPU vs. specialized hardware
• Password hashing: How the service stores passwords
• Knowledge of patterns: If attackers know your password structure

What Makes a Password Strong?

A strong password combines several key characteristics:

• Length: Minimum 12 characters, 16+ for important accounts
• Complexity: Mix of uppercase, lowercase, numbers, and symbols
• Unpredictability: No common words, phrases, or patterns
• Uniqueness: Not reused across different accounts
• No personal information: Avoid names, birthdays, pet names

Common Weaknesses We Detect

Our analyzer checks for these common vulnerabilities:

• Dictionary words: Common words that are easy to guess
• Sequential characters: Like "12345" or "qwerty"
• Repeated characters: Patterns like "aaa" or "111"
• Keyboard patterns: Common keyboard walks
• Personal information: Names, dates, phone numbers
• Common substitutions: Like "p@ssw0rd" for "password"

Limitations of Password Strength Checkers

While our tool provides valuable insights, it's important to understand its limitations:

• No actual cracking: We estimate, not actually crack passwords
• Local analysis only: We don't check against known breach databases
• Mathematical models: Estimates based on ideal conditions
• Can't detect all patterns: Some clever patterns might score higher than they should

For comprehensive security, use our checker as one tool among many, including password managers, two-factor authentication, and regular security audits.

Technical Implementation

All analysis happens 100% locally in your browser. Your password never leaves your device. We calculate entropy using Shannon's formula, considering character set size and password length. The crack time estimates use mathematical models based on current hardware capabilities and common attack methodologies.