Does this tool send my password anywhere?

No. All calculations run in JavaScript in your browser. You can verify this by opening DevTools and watching the network tab — no request is made when you type.

What entropy counts as strong?

Under 28 bits is weak, 28–50 is fair, 50–80 is good, and 80 or more is strong against offline attacks on modern hardware.

Are passphrases safer than complex passwords?

Usually yes. Four random words from a 7,776-word list give about 51 bits of entropy and are far easier to remember than a random 10-character string.

Password Security Checker

Your password never leaves your browser. All analysis runs locally in JavaScript — nothing is sent to any server.

Enter a password to check

Passphrase Suggestion

Passphrases — multiple random words joined together — are easier to remember and harder to crack than short complex passwords.

marble-impala-jumble-rabbit

Entropy: 28.48 bits — equivalent to a 5-character random alphanumeric password

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Analyze your password's strength with entropy calculation, crack time estimates for multiple attack scenarios, and common password detection.