Weak password
password = password123
Result: Very Weak - common password, sequential numbers, no symbols.
Password Strength Checker
Check the strength of any password without sending it to a server. The tool calculates entropy, identifies common weaknesses (short length, keyboard patterns, common passwords, sequential characters), and provides a strength rating. This is an estimate - real-world security depends on how the password is used and stored.
Privacy: this tool processes all data entirely in your browser. Passwords and hashes are never sent to the server.
Enter your values and press Calculate — the result appears here.
Worked examples
Strong password
password = Tr0ub4dor&3#xK9!
Result: Strong - high entropy, mixed character types.
Frequently asked questions
Is my password uploaded or stored?
No. Password analysis happens entirely in your browser using JavaScript. Nothing is transmitted to any server, and nothing is stored in cookies or localStorage.
Is the strength rating accurate?
The rating is an estimate based on entropy calculations and pattern detection. Real-world security also depends on: how the password is stored (use a password manager), whether it's unique across accounts, and whether two-factor authentication is enabled.
What does "entropy" mean?
Entropy measures the randomness of a password in bits. Higher entropy means more possible combinations, making brute-force attacks harder. A password with 80+ bits of entropy is considered very strong.
Why does my strong password show warnings?
The tool checks for common patterns even in strong passwords. Warnings help you avoid habits that could weaken security, like using keyboard patterns or repeated characters.
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