Password Strength Checker
Analyze your password strength with entropy scoring, crack time estimates, and actionable improvement suggestions.
Strength Analysis
Enter a password to analyze
Entropy, crack time & suggestions
Check Your Password
Your password is never sent anywhere — all analysis happens in your browser.
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Everything you need to know
How Password Strength Is Measured
This tool evaluates your password across multiple dimensions: length, character diversity (uppercase, lowercase, digits, symbols), common password detection, sequential patterns, and repeated characters. The result is a comprehensive strength rating from Very Weak to Very Strong.
Understanding Entropy
Entropy measures password randomness in bits. Each bit doubles the number of possible combinations. A 40-bit password has roughly 1 trillion possibilities, while an 80-bit password has over a quintillion — making brute-force attacks impractical.
Estimated Crack Time
Crack time is calculated assuming a powerful attacker with a GPU cluster performing 10 billion password guesses per second. This represents a realistic worst-case scenario. Passwords with 60+ bits of entropy typically require years to crack even at this speed.
Tips for Stronger Passwords
- Use 16+ characters — length is the most important factor in password security
- Mix all character types — uppercase, lowercase, digits, and symbols
- Avoid common words — dictionary words and names are easily cracked
- Use a password manager — generate and store unique passwords for every account
- Enable 2FA — two-factor authentication adds a critical second layer of defense
Related Tools
Generate secure passwords with the Password Generator, or encrypt sensitive text with the Encryption Tool.