Test how strong a password is. Get instant entropy in bits, crack-time estimates, and per-character feedback — all in your browser.
A privacy-first password strength checker. Type or paste any password and instantly see estimated entropy in bits, an offline crack-time estimate, and a checklist of what is good and what could be improved. Detects sequences, repeats, and common dictionary passwords. Your password never leaves your browser.
Got questions? We’ve got answers. Here are some of the most common inquiries about Password Strength Checker.
Check your password
Type below — we estimate strength locally and never transmit your password anywhere.
Your password is checked entirely in your browser.
Strength
Live entropy and crack-time estimate.
Estimated strength
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