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Check if this password has appeared in known data breaches using Have I Been Pwned. Uses k-anonymity — your full password is never sent.
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No. All strength analysis happens locally in your browser. For the breach check, only the first 5 characters of the SHA-1 hash are sent (k-anonymity), so your full password is never transmitted.
Entropy measures the randomness of a password in bits. Higher entropy means more possible combinations and a stronger password. A password with 80+ bits of entropy is considered very strong.
We use the Have I Been Pwned API with k-anonymity. Your password is hashed with SHA-1, and only the first 5 characters of the hash are sent to the API. The API returns all matching hashes, and the comparison happens locally in your browser.
A password that would take centuries or millennia to crack at 10 billion guesses per second is considered very strong. Anything under a year is weak by modern standards.
The checker looks for sequential characters (abc, 123), repeated characters (aaa), keyboard patterns (qwerty), common substitutions (p@ssw0rd), and dictionary words.