Password Strength Checker
Entropy, crack-time estimate and plain-English advice.
Type a password…
0
Entropy (bits)
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Character classes
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Offline crack estimate
Suggestions
Everything is computed in your browser — the password never leaves this page. Estimates assume an attacker at 1011 guesses/second (modern hardware), which is why a long passphrase often beats a short “complex” password.
使い方
- すべてブラウザ内でローカルに動作します。データは送信されず、アカウントも不要です。
概要
Estimates entropy in bits from character classes and uniqueness, flags common dictionary patterns, and translates the result into an offline crack-time estimate at roughly a hundred billion guesses per second.
The headline finding matches most security guidance: length beats symbol-spice. A 16-character passphrase usually beats an 8-character password with everything in it.
すべてブラウザ内でローカルに動作します。データは送信されず、アカウントも不要です。
Embed this tool
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