Password Strength Tester
Find out how strong your password really is — powered by the same zxcvbn library Dropbox built. 100% in your browser.
Runs in your browser Real entropy + crack time Never logged
Runs entirely in your browser using the open-source zxcvbn library. Nothing is logged or sent.
—0 chars · ~0 bits
Estimated crack time
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(offline, 10k guesses/sec)
Guesses needed
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What it checks
Real strength score
Uses zxcvbn to detect dictionary words, keyboard patterns, dates, repeats, and leet-speak — far more accurate than 'has uppercase' rules.
Crack-time estimate
Calculates how long an offline attacker would need to crack the password assuming a slow hash like bcrypt.
Improvement tips
Get plain-English suggestions and warnings on how to make a weak password significantly stronger.
Frequently Asked Questions
Quick answers about the password strength tester.
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