Password Strength Checker
Check how strong your password is instantly. See entropy score, crack time estimate, and specific improvement suggestions. Nothing is stored or sent anywhere.
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Frequently asked
questions
No. All analysis runs entirely in your browser using JavaScript. Your password never leaves your device and is never stored or logged anywhere.
Length is the single most important factor — every added character multiplies the time to crack. Use at least 16 characters mixing letters, numbers, and symbols. Avoid dictionary words, names, dates, and keyboard patterns like "qwerty".
Entropy (measured in bits) is a mathematical measure of password unpredictability. Each additional bit doubles the number of guesses needed to crack the password. A 60-bit password requires about 2^60 guesses — generally considered strong.