Password Strength Checker

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Understanding password strength

Password strength measures the resistance of a password against common attack methods like brute-force guessing, dictionary attacks, and credential stuffing. A high-entropy password—one with many possible combinations—takes longer to crack. Entropy increases with length and character variety. For example, a 12-character password that uses uppercase, lowercase, numbers, and symbols has significantly more entropy than an 8-character lowercase-only password.

How to create strong passwords

Use a passphrase composed of several random words or use a password manager’s generator. A passphrase is easier to remember yet long enough to provide good entropy. Add digits and symbols for extra complexity. Avoid predictable substitutions like replacing o with 0 or a with @ because attackers include those patterns in their cracking lists.

FAQ

12 characters with mixed character types is a common minimum for strong passwords. For sensitive accounts, longer passphrases (16+ characters) provide extra safety. Use a password manager to manage long passwords conveniently.

Yes—symbols increase entropy and make passwords harder to crack. However, usability matters; avoid symbols that certain systems might reject, and prefer a manager-generated password when possible.

Yes, reputable password managers use strong encryption and are much safer than reusing or writing down passwords. Always use a trusted provider and enable two-factor authentication if available.

No, password strength is checked instantly in your browser. Your password is never sent to a server or stored.