Password Strength Checker: How Strong Is Your Password?

Not all passwords are created equal. A password that looks complex to you might be trivially crackable by modern tools. Our Password Strength Checker analyzes your password entirely in your browser and gives you a clear strength score with specific suggestions for improvement.

How Password Strength Is Measured

Password strength depends on entropy — a measure of unpredictability. Higher entropy means more possible combinations an attacker must try. Our checker evaluates several criteria:

• Length: Each additional character exponentially increases combinations
• Character variety: Using uppercase, lowercase, numbers, and symbols expands the character pool
• Patterns: Sequential characters (abc, 123) and keyboard patterns (qwerty) are easily guessable
• Common passwords: We check against a list of the most commonly used passwords

Understanding Crack Time

The checker estimates how long it would take to crack your password assuming 10 billion guesses per second (a realistic rate for offline hash cracking with modern GPUs). Here’s how different passwords compare:

Password	Entropy	Crack Time
password	~18 bits	Instantly
P@ssw0rd	~30 bits	Seconds
kJ#mP9$vR2	~65 bits	Years
aX7$mK9#pL2@nQ5	~99 bits	Billions of years

How to Use the Checker

1. Enter your password: Type or paste it into the input field
2. Review the score: See your strength rating from 0-100
3. Check criteria: Each requirement shows pass/fail status
4. Read suggestions: Get specific advice for improving weak passwords
5. Toggle visibility: Show/hide your password while checking

Everything happens locally in your browser. Your password is never transmitted anywhere.

Common Password Mistakes

• Using personal information (names, birthdays, pet names)
• Adding predictable suffixes (!, 1, 123)
• Substituting letters with obvious numbers (p@ssw0rd)
• Reusing passwords across multiple accounts
• Using dictionary words, even with modifications

Frequently Asked Questions

Is my password sent to a server? No. All analysis happens in your browser using JavaScript. Nothing leaves your device.

What score should I aim for? 80+ is “Very Strong.” For critical accounts, aim for 90+. Below 50 needs improvement.

Does a high score guarantee safety? No. Even a strong password is vulnerable if the service storing it has a breach, which is why unique passwords and 2FA are essential.

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Try our free Password Strength Checker to analyze your passwords now.