Password Strength Meter

Check password strength using entropy math

Enter Password
Analysis
Very Weak
0 bits entropy
Length: 0
< 1 second

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What is Password Entropy?

Password entropy measures unpredictability in bits. Higher entropy means harder to crack. Calculated as log2(character set size ^ length). Our meter checks length, character diversity (uppercase, lowercase, numbers, symbols), and common patterns to estimate real-world strength using the zxcvbn algorithm approach.

Frequently Asked Questions

What makes a password strong?
Length (12+ chars), character variety (upper/lower/numbers/symbols), no dictionary words, and randomness. Each factor increases the search space exponentially.
How is crack time estimated?
Based on entropy and assumed attack speed (10 billion guesses/sec). 128+ bits entropy is considered secure against all current attacks. Lower entropy can be cracked in seconds to years.
Should I use password managers?
Yes! Password managers generate and store high-entropy random passwords so you don't need to remember them. Only need to remember one master password.