Password Strength Checker

A Password Strength Checker website is a tool that allows users to evaluate the strength of their passwords. It typically analyzes a given password based on several factors to determine how secure it is. These factors include:

1. Length: Longer passwords are generally stronger.
2. Complexity: The use of uppercase letters, lowercase letters, numbers, and special characters (such as !, @, #) enhances password strength.
3. Common Patterns: The website may identify if the password uses common or easily guessable patterns like "12345" or "password".
4. Dictionary Words: Passwords containing dictionary words, especially common ones, are considered weak.
5. Entropy: Entropy refers to the unpredictability of the password. A password with higher entropy is harder to guess.
6. Reusability: The website may warn against using the same password across multiple accounts, as this makes all linked accounts more vulnerable if one is breached.

The tool often assigns a strength rating such as Weak, Fair, Good, or Strong and may offer suggestions for improvement. Some websites even include a visual password meter to show the strength at a glance.

Additionally, many Password Strength Checker tools will help users generate strong passwords and provide guidance on best practices for creating and managing secure passwords, including recommendations for using password managers.

By using this tool, users can ensure their passwords are resilient against brute force attacks, dictionary attacks, and other common methods employed by hackers.