Type or paste a password into the field; the strength bar, score, and crack-time estimate update as you type. Use the Show button to verify what you typed.
The score comes from zxcvbn, a pattern-matching and dictionary-attack model, not a simple length or character-class rule. It checks the password against common passwords, keyboard patterns, dates, and predictable substitutions, then estimates how long it would take to crack under an online-throttled attack and an offline fast-hashing attack. Nothing you type is uploaded, logged, or checked against a breach database - the score is computed entirely in this browser tab.
Password Strength Checker
Check how strong a password is before you use it - a 0 to 4 score, an estimated crack time, and specific suggestions.
The score comes from zxcvbn, the same pattern-matching + dictionary-attack model used by Dropbox, not a simple length/character-class rule - it flags common passwords and predictable patterns that "P@ssw0rd1" style rules miss.
Everything runs in the browser - no upload, no account, and the password is never sent anywhere, logged, or checked against a breach-database API.
Frequently Asked Questions
What does Password Strength Checker do?
Check how strong a password is before you use it - a 0 to 4 score, an estimated crack time, and specific suggestions.
When should I reach for password strength checker?
The score comes from zxcvbn, the same pattern-matching + dictionary-attack model used by Dropbox, not a simple length/character-class rule - it flags common passwords and predictable patterns that "P@ssw0rd1" style rules miss.
What complementary tools work well alongside password strength checker?
This tool does not store or recover passwords; it only scores whatever is currently typed into the field.