Password Strength Checker

Test how secure your passwords are with our advanced strength analyzer

security Security Notice

This tool processes everything locally in your browser. Your password is never sent to our servers or stored anywhere. However, for maximum security, we recommend not entering passwords you currently use for sensitive accounts.

A strong password typically has several characteristics:

  • At least 12 characters long
  • Uses a mix of uppercase and lowercase letters, numbers, and special characters
  • Avoids common words or patterns
  • Doesn't contain personal information

However, modern password strength evaluation goes beyond these basic rules to consider factors like predictable substitutions (e.g., 'a' to '@'), keyboard patterns, and susceptibility to dictionary attacks.

A password strength checker analyzes your password using multiple algorithms to identify potential weaknesses. It checks for:

  • Dictionary words and common passwords
  • Keyboard patterns (like "qwerty" or "12345")
  • Repeated sequences
  • Predictable substitutions (like "a" to "@")

Advanced checkers like ours use entropy calculations to estimate how long it would take for different types of attacks to crack your password. The tool then provides a strength score and specific recommendations for improvement.

Our password strength checker processes everything locally in your browser - your password is never sent to our servers or stored anywhere. However, as a general security practice, we recommend not entering passwords you currently use for sensitive accounts.

Instead, you can:

  • Test similar passwords with the same pattern
  • Test new passwords before you start using them
  • Use a slightly modified version of your actual password

Simple password checkers typically only look at basic factors like length and character variety. Advanced checkers like ours use sophisticated algorithms to detect patterns, common substitutions, and realistic cracking scenarios.

We implement the zxcvbn algorithm, which provides more accurate strength estimation by simulating various attack methods and considering factors like:

  • Dictionary words and common passwords
  • Keyboard patterns and sequences
  • L33t speak substitutions
  • Common password structures
  • Realistic cracking time estimates