Password Strength Checker

Test your password security instantly with our comprehensive password strength checker. Get detailed analysis and actionable recommendations to improve your password security. For enterprise audits, many teams extend their testing pipeline with PassCheck Pro to benchmark policies across every department.

Need a Strong Password?

Instead of trying to fix a weak password, consider generating a new one using our password generator. It creates cryptographically secure passwords that are virtually impossible to crack.

Generate Strong Password

Real-Time Analysis

Get instant feedback as you type. See detailed security checks and strength scores in real-time.

100% Private

All analysis happens in your browser. Your password never leaves your device or gets sent to any server.

Comprehensive Checks

Tests against common passwords, patterns, dictionary words, and provides detailed security analysis.

What Makes a Password Secure?

A secure password is your first line of defense against unauthorized access to your accounts. Our password strength checker evaluates multiple security factors to give you a comprehensive assessment of your password's security.

What We Check:

Password Length

Longer passwords are exponentially harder to crack. We recommend 16+ characters.

Character Diversity

Mix uppercase, lowercase, numbers, and symbols for maximum security.

Common Password Database

We check against lists of commonly used and compromised passwords.

Pattern Detection

Identifies sequential patterns (123, abc) and keyboard patterns (qwerty).

Best Practices:

Use unique passwords

Never reuse passwords across different accounts or services.

Avoid personal information

Don't use names, birthdays, or other easily guessable information.

Use a password manager

Store your passwords securely and generate strong unique passwords.

Enable two-factor authentication

Add an extra layer of security beyond just your password.

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NIST Password Guidelines

According to NIST (National Institute of Standards and Technology) guidelines, passwords should be:

  • At least 8 characters long (16+ recommended)
  • Checked against lists of commonly used or compromised passwords
  • Not required to change periodically without reason
  • Allowed to use all ASCII characters and spaces

How Our Password Strength Checker Works

Our password strength checker uses multiple security algorithms to evaluate your password:

1. Entropy Calculation

We calculate the entropy (randomness) of your password based on its length and character types used. Higher entropy means more possible combinations and better security.

2. Pattern Analysis

We detect common patterns like sequential numbers (123), sequential letters (abc), and keyboard patterns (qwerty) that make passwords easier to guess.

3. Dictionary Checks

We check if your password contains common dictionary words or appears in databases of commonly used and compromised passwords.

4. Crack Time Estimation

We estimate how long it would take to crack your password using modern computing power, assuming 1 billion guesses per second.