Password Strength Checker
Instantly analyze your password's security. Check length, complexity, and vulnerability patterns — all in your browser, never sent anywhere.
Security Checklist
- At least 8 characters
- At least 12 characters (recommended)
- Uppercase letter (A-Z)
- Lowercase letter (a-z)
- Number (0-9)
- Special character
- No repeated characters
- No sequential patterns
Generate a Strong Password
How Password Strength Is Calculated
Measured in bits of entropy. Higher entropy = longer crack time. <28 bits = very weak (cracked instantly). 60-79 bits = strong (centuries). 80+ bits = very strong (millions of years).
Common Password Mistakes
- Dictionary words — Use 3+ random words: "elephant puzzle candle"
- Personal info — Never use names, birth years, or pet names
- Keyboard patterns — "qwerty123" is guessed instantly
- Reusing passwords — Use a password manager for unique passwords
Frequently Asked Questions
Is my password sent to your server?
No. All analysis happens in your browser. We never see or store your password.
What password length is safe?
Minimum 12 characters. For email and banking, 16+.
Should I use a password manager?
Yes. Bitwarden (free), 1Password, or Apple Keychain generate and store unique passwords.
Does two-factor authentication help?
Yes. Enable 2FA on all accounts that support it — even if your password is stolen, attackers can't access your account.