Password Strength Checker

Test the strength of a password and learn which factors make it easier or harder to crack.

Quick Answer: What a Password Strength Check Measures

A password strength checker estimates how resistant a password may be to brute-force or guessing attacks by looking at traits such as length, variety, and predictability. It is useful for quick screening, but the most reliable approach is still to use unique random passwords and avoid reusing them across sites.

All analysis happens locally in your browser. The password is never sent to any server.

What Makes a Strong Password?

Attackers use automated tools that can attempt billions of guesses per second. Short or predictable passwords are quickly broken by brute-force or dictionary attacks.

A strong password combines sufficient length with a mix of character types and avoids obvious patterns. The goal is to make brute-force attacks computationally expensive and time-consuming.

Tips for Creating Better Passwords

  • Aim for at least 12–16 characters, especially for important accounts.
  • Combine uppercase letters, lowercase letters, numbers, and symbols.
  • Avoid common words, phrases, keyboard patterns, and personal details.
  • Use a reputable password manager to generate and store unique passwords for each site.
  • Enable multi-factor authentication (MFA) wherever possible.