Check how strong your password really is. Get an entropy score, detailed breakdown, and actionable tips. Nothing is sent anywhere.
Entropy is a measure of how hard a password is to guess, in bits. It's roughly length × log2(character-pool-size). Under 40 bits is weak, 60 is fair, and 80+ bits is strong against modern offline brute-force attacks (which can try billions of guesses per second).
No. The password you type stays in your browser. There's no network call, no breach database lookup, and no analytics event with the value — the tool works fully offline once the page has loaded.
Each extra character multiplies the search space by the full pool size (usually 70+). So adding two more lowercase letters typically grows entropy more than adding a single symbol. Long passphrases like correct-horse-battery-staple are both easier to remember and harder to crack than short cryptic ones.