Password strength checker
How strong is your password? zxcvbn analysis in your browser.
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Frequently asked questions
How is password strength measured?
We use zxcvbn, an analyzer developed at Dropbox that combines common-word dictionaries, keyboard patterns, typical substitutions (a→@, e→3), and dates. The score goes from 0 (trivial) to 4 (strong) — more realistic than just counting characters and symbols.
Why does it say my 12-character password with symbols is weak?
It probably follows a predictable pattern: a dictionary word with obvious substitutions ("P@ssw0rd!"), a date, or a keyboard sequence ("qwerty123"). Attackers try these patterns first — much faster than brute force.
Is my password sent to a server?
No. All analysis runs in your browser with JavaScript. The dictionaries and adjacency graphs are loaded into your tab and processed locally. Nothing is sent anywhere.