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Password Strength Checker
Enter Your Password
Check Your Password Strength
Enter a password to see how strong it is and get suggestions for improvement.
About Password Strength
What Makes a Strong Password?
- At least 12 characters long (16+ is better)
- Mix of uppercase and lowercase letters
- Include numbers and special characters
- Avoid common words and patterns
- Never reuse passwords across accounts
What is Entropy?
Entropy measures the randomness of your password in bits. Higher entropy means more possible combinations and harder to crack. Aim for 60+ bits for good security.
Password Best Practices
- Use a password manager to generate and store passwords
- Enable two-factor authentication (2FA) when available
- Consider using passphrases (e.g., "correct-horse-battery-staple")
- Change passwords if you suspect a breach
Crack Time Estimation
We estimate crack time assuming 10 billion guesses per second (modern GPU cluster). Real-world times may vary based on attack methods and hardware.
Password Strength Checker
What is Password Strength Checker?
Password Strength Checker is a free online tool that analyzes your password and tells you how secure it is. It checks for length, character variety, common patterns, and estimates how long it would take for hackers to crack your password. All analysis happens in your browser - your password is never sent to any server.
Why Would You Need to Check Password Strength?
Strong passwords are your first line of defense against hackers:
- Prevent account breaches: Weak passwords are the #1 cause of hacked accounts
- Protect sensitive data: Your email, banking, and social media accounts contain private information
- Avoid identity theft: Criminals use weak passwords to steal identities
- Meet security requirements: Many websites now require strong passwords
How to Check Password Strength - Step by Step
- Enter your password: Type or paste your password in the input field
- View instant results: See your strength score, crack time estimate, and detailed analysis
- Check the requirements: See which security criteria your password meets
- Read suggestions: Get personalized tips to make your password stronger
- Improve and retest: Modify your password and check again until you reach a strong rating
Key Features
- Real-time analysis: Results update instantly as you type
- Crack time estimation: See how long it would take to crack your password
- Entropy calculation: Measure the mathematical randomness of your password
- Common password detection: Warns if your password is on the most-used list
- Pattern detection: Identifies sequential and repeated characters
- Privacy-focused: Everything runs locally in your browser
Tips for Best Results
- Use at least 12 characters (16+ is even better)
- Mix uppercase, lowercase, numbers, and special characters
- Avoid personal information like names, birthdays, or pet names
- Consider using passphrases like "correct-horse-battery-staple"
- Use a different password for each account
- Consider using a password manager
Frequently Asked Questions
Is my password sent to your server?
No. All password analysis happens entirely in your browser using JavaScript. Your password never leaves your device and is never transmitted over the internet.
What is password entropy?
Entropy measures the randomness of your password in bits. Higher entropy means more possible combinations, making your password harder to crack. Aim for at least 60 bits of entropy for good security.
How accurate is the crack time estimate?
We estimate crack time assuming 10 billion guesses per second (a modern GPU cluster). Real-world times vary based on the attack method, hardware used, and whether your password appears in leaked databases.
What makes a password "common"?
Common passwords appear frequently in data breaches and hacker dictionaries. Examples include "password", "123456", "qwerty", and "letmein". These are the first passwords hackers try.