Password Strength Calculator
Free password strength analyzer to check security, calculate entropy, and estimate crack time. Get suggestions to improve your passwords. All analysis happens locally - your password is never transmitted.
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Check Your Password Strength
A strong password is your first line of defense against hackers. Our calculator analyzes your password's strength, calculates how long it would take to crack, and provides actionable suggestions for improvement - all without ever transmitting your password.
How is Password Strength Measured?
Password strength is measured by entropy - the amount of randomness or unpredictability. Higher entropy means more possible combinations, making brute-force attacks impractical. Entropy is calculated based on password length and the character set used.
Entropy Formula
Entropy (bits) = Length Ă logâ(Charset Size)Why Strong Passwords Matter
Data Protection
Strong passwords protect your personal information, financial data, and online identity.
Account Security
Weak passwords are the leading cause of account breaches and identity theft.
Regulatory Compliance
Many industries require strong password policies for regulatory compliance.
How to Use the Password Strength Calculator
Password Best Practices
Use 12+ Characters
Longer passwords exponentially increase the possible combinations.
Mix Character Types
Include lowercase, uppercase, numbers, and special characters.
Avoid Patterns
Don't use keyboard patterns (qwerty), sequences (123), or common words.
Use a Password Manager
Let a password manager generate and store unique passwords for each account.
Frequently Asked Questions
No. All analysis happens directly in your browser using JavaScript. Your password never leaves your device and is not stored or transmitted.