How Password Strength Is Measured
Password strength is fundamentally about entropy — the mathematical measure of unpredictability. A password with high entropy has so many possible combinations that even the fastest computers would need impractical amounts of time to guess it through brute force.
What Makes a Password Weak?
Our checker goes beyond simple character counting. It detects:
- Common passwords — checked against a database of frequently breached passwords
- Keyboard patterns — sequences like "qwerty" or "123456"
- Repeated characters — patterns like "aaa" or "abcabc"
- Dictionary words — including leet-speak substitutions (p@$$w0rd)
Improving Your Password
The most effective ways to strengthen a password are: increase length (each character multiplies the combinations), use all four character types (uppercase, lowercase, numbers, symbols), and avoid any predictable patterns. Or simply use our Password Generator or Passphrase Generator to create a strong password automatically.