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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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.
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 × log₂(Charset Size)Strong passwords protect your personal information, financial data, and online identity.
Weak passwords are the leading cause of account breaches and identity theft.
Many industries require strong password policies for regulatory compliance.
Longer passwords exponentially increase the possible combinations.
Include lowercase, uppercase, numbers, and special characters.
Don't use keyboard patterns (qwerty), sequences (123), or common words.
Let a password manager generate and store unique passwords for each account.
No. All analysis happens directly in your browser using JavaScript. Your password never leaves your device and is not stored or transmitted.