Password Strength Calculator
Check how secure your password is and how long it would take to crack
Score
Length
Complexity
Entropy
Estimated Time to Crack
Less than a second
Password Strength Calculator: How Secure Is Your Password?
In today's digital world, passwords are your first line of defense against unauthorized access to your accounts and sensitive information. Our Password Strength Calculator helps you determine how secure your passwords truly are and provides insights into their vulnerability to brute force attacks.
Real-Time Analysis
Our calculator instantly analyzes your password's strength using advanced algorithms that evaluate multiple security factors.
Comprehensive Metrics
Get detailed insights including entropy bits, complexity score, and estimated time required to crack your password.
Privacy Focused
All calculations are performed locally in your browser. Your passwords are never stored or transmitted over the internet.
How the Password Strength Calculator Works
Our calculator evaluates passwords based on several key factors that contribute to overall security:
Length
Password length is one of the most critical factors in password security. Generally, longer passwords provide exponentially greater security against brute force attacks. Each additional character significantly increases the number of possible combinations an attacker would need to try.
Character Variety
Strong passwords combine uppercase and lowercase letters, numbers, and special characters. Using different character types increases the complexity and makes passwords harder to guess or crack through brute force methods.
Entropy Calculation
Password entropy is a measure of unpredictability and randomness, calculated in bits. Higher entropy values indicate stronger passwords. Our calculator provides an entropy score that reflects how random and unpredictable your password is to potential attackers.
Time to Crack Estimation
Based on the calculated strength, our tool estimates how long it would take for a computer to crack your password using current technology. This helps you understand the real-world implications of your password's strength.
Creating Stronger Passwords
If our Password Strength Calculator indicates that your password is weak or moderate, consider these tips for creating stronger passwords:
- Use a minimum of 12 characters — the longer, the better
- Include a mix of uppercase and lowercase letters, numbers, and special characters
- Avoid common words, phrases, or predictable patterns
- Don't use personal information that others might know or could easily discover
- Consider using a passphrase — a sequence of random words — which can be both secure and memorable
- Use different passwords for different accounts, especially for critical services
Frequently Asked Questions About Password Security
A strong password typically has several characteristics: it's at least 12 characters long, contains a mix of uppercase and lowercase letters, numbers, and special characters, avoids common patterns or dictionary words, and isn't based on personal information. The key is to maximize both length and complexity while creating something you can still remember.
Current security best practices suggest that frequent mandatory password changes aren't necessary if you're using strong, unique passwords for each account. Instead, change passwords immediately if there's any indication of a breach. However, for critical accounts (financial, email), consider changing passwords every 6-12 months as a precaution.
Yes. Our Password Strength Calculator runs entirely in your browser — your password is never sent to our servers or stored anywhere. The strength analysis happens locally on your device. However, we still recommend not checking your actual current passwords on any online tool as a general security practice. Instead, use similar passwords with the same pattern to test strength.
Absolutely. Password managers solve several key security problems: they generate truly random, strong passwords; store them securely; and fill them automatically, eliminating the need to remember multiple complex passwords. They also help prevent phishing attacks since they match passwords to legitimate websites. Most security experts consider using a reputable password manager one of the most effective steps you can take to improve your online security.
Entropy is a measure of password unpredictability, calculated in bits. Higher entropy means more randomness and better security. A password with 80 bits of entropy would require an average of 2^79 guesses to crack. Passwords with higher entropy are exponentially harder to break through brute force attacks. Our calculator shows entropy to help you understand your password's mathematical strength against systematic guessing attempts.
Remember that even the strongest password can be compromised through other means, such as phishing attacks or data breaches. For maximum security, always use unique passwords across different accounts and consider enabling two-factor authentication where available.