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Password strength checker
Score a password with zxcvbn — Dropbox's guessing model — and see exactly which dictionary words, repeats, or patterns an attacker would play first. The dictionaries load on first run; the password never leaves the tab.
- No breach-database check — that needs a third-party k-anonymity request (rejected by plan); zxcvbn knows common passwords from its bundled list only.
- The password lives in this tab’s memory while you type. Nothing is sent or stored — and a browser tab cannot guarantee the memory is zeroized after.
- A strong score on this page does not make a password right for your site — length, uniqueness per site, and how you store it matter more.
Nothing in yet
Paste, drop, or type to begin. Everything stays on this device.
type a password and score it