Check Your Password Strength

Test how secure your password really is. Our strength checker analyzes complexity and common vulnerabilities to give you actionable advice.

Password to Check

How It Works

This password strength checker analyzes your password against multiple security criteria to give you a comprehensive assessment of its resilience against attacks.

The analysis evaluates:

Length scoring: Passwords under 8 characters are flagged as too short. Each additional character beyond 12 adds meaningful security.
Character diversity: Checks for lowercase, uppercase, numbers, and symbols. Using all four types significantly increases complexity.
Pattern detection: Identifies common passwords ("password123"), sequential characters ("abc123"), repeated characters ("aaa"), and keyboard walks ("qwerty").
Leet speak detection: Catches predictable substitutions like @ for 'a', 0 for 'o', or 1 for 'i' that don't add real security.
Entropy calculation: Computes the mathematical randomness in bits, factoring in length and character set size.
Crack time estimation: Estimates how long brute-force attacks would take at modern GPU speeds (10 billion guesses/second).

The result is a strength rating from "Very Weak" to "Very Strong" along with specific suggestions for improvement tailored to your password's weaknesses.

When You'd Actually Use This

Before Creating Important Accounts

Test your password before using it for email, banking, or other critical services to ensure it's actually strong.

After Data Breach Notifications

When forced to change a password, use the checker to verify your new one is genuinely better than the compromised one.

Corporate Password Policy Enforcement

IT teams can use this to validate that employee passwords meet security requirements before account creation.

Security Awareness Training

Show employees why their 'clever' password modifications (P@ssw0rd!) aren't as secure as they think.

Personal Security Audit

Test all your frequently used passwords to identify which accounts need immediate password upgrades.

Password Manager Migration

When moving to a password manager, check which existing passwords are weak and prioritize changing those first.

What to Know Before Using

This tool doesn't store your password

All analysis happens in your browser. Your password is never sent to any server or stored anywhere. You can verify this by checking that the page works offline.

Strength doesn't guarantee safety

A 'Very Strong' password can still be compromised through phishing, keyloggers, data breaches, or reuse across sites. Strength is just one layer of security.

Pattern detection has limits

The checker catches common patterns but can't detect personal information (birthdays, pet names) that attackers might guess through social engineering.

Don't test passwords you're actively using

While this tool is safe, it's better practice to test variations or similar passwords rather than typing your actual live password into any web tool.

Crack times are estimates

Real-world cracking depends on the hash algorithm, available hardware, and whether your password is in a dictionary. Use times as relative comparisons, not absolute guarantees.

Common Questions

What makes a password 'Very Strong'?

A Very Strong password typically has 16+ characters, uses all four character types (lowercase, uppercase, numbers, symbols), contains no patterns or dictionary words, and scores 80+ bits of entropy.

Is a long passphrase better than a short complex password?

Usually yes. 'correct horse battery staple' (25 characters, all lowercase) is stronger and more memorable than 'Tr0ub4dor&3' (11 characters). Length often beats complexity.

Why does the checker flag my 'clever' substitutions?

Attackers know about leet speak (@ for a, 0 for o, etc.). These substitutions add almost no security because they're included in cracking dictionaries. Real randomness is better.

How often should I check my password strength?

Check when creating new passwords or changing existing ones. There's no benefit to repeatedly testing the same password - focus on using unique, strong passwords everywhere.

What's the minimum strength for important accounts?

For email, banking, and other critical accounts, aim for 'Strong' or 'Very Strong' ratings. 'Moderate' might suffice for low-risk accounts, but never use 'Weak' or 'Very Weak' passwords.

Does adding symbols always make passwords stronger?

Symbols increase the character set size, which helps. But adding 4 random characters is often better than adding 4 symbols to a short password. Prioritize length first, then diversity.

Can I use this to test my password manager's generated passwords?

Absolutely! It's a great way to verify your password manager is creating genuinely strong passwords. Most reputable managers will consistently produce 'Very Strong' results.

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