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Password Strength

Analyze password strength using zxcvbn — the same algorithm used by Dropbox. Get a score from 0 (worst) to 4 (best), entropy bits, crack-time estimates across attack scenarios, and specific feedback on how to improve weak passwords.

Features

Frequently Asked Questions

How is the score calculated?
The zxcvbn algorithm estimates strength by checking against common passwords, dictionary words, patterns, and keyboard walks, then returns a score from 0 (very weak) to 4 (very strong).
Is my password sent to a server?
No. All analysis runs locally in your browser — the password never leaves your device.
What are the crack-time estimates?
zxcvbn estimates how long different attackers would take — from online throttled attacks to offline fast-hash cracking — giving a realistic picture of real-world security.