Password Strength

Check strength

Type a password to see score, guessed crack time, and warnings. Evaluation stays in this tab.

Runs in your browser. Inputs stay on this device — nothing is uploaded to BrowserSpaces for processing.

zxcvbn

Industry-standard estimator.

Crack times

Online and offline scenarios.

Feedback

Suggestions to improve.

Private

Password is not uploaded.

Use the tool

Password

Type a password to estimate strength locally.

How it works

Offline strength model

zxcvbn runs entirely in JavaScript against common patterns and dictionaries bundled with the library.

Three steps