Estimate entropy and rough cracking windows locally in your browser. This page keeps password history disabled.
Estimated Strength
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Enter a password or passphrase to estimate rough entropy, pattern penalties, and online vs offline crack-time windows.
Tap an example to prefill the calculator with sample values.
Common seasonal pattern
Short mixed password with a predictable word and year
A password can use uppercase, digits, and a symbol but still be easy to guess if it follows a common pattern.
Result: Usually lands in the fair range, not strong.
Long passphrase
Multi-word phrase with digits and punctuation
Longer passphrases often outperform short random-looking passwords because length compounds the search space quickly.
Result: Typically produces a strong or very strong estimate.
Mixed random string
Longer mixed-character password without an obvious pattern
A high-entropy password can be strong without being a full passphrase if it avoids predictable themes and reuse.
Result: Usually produces a strong estimate with much better offline resistance.