Password Strength Checker – Test How Strong & Secure Your Password Is
Check your password security instantly with our Password Strength Scorer. Evaluate entropy, length, character variety, and pattern vulnerabilities to see how strong your password is and get recommendations for creating uncrackable passwords.
Results
Enter a password and click Check Strength to see results
How to Check Password Strength
Enter Your Password
Type or paste the password you want to evaluate into the input field.
Click Check Strength
The calculator analyzes length, character variety, entropy, and common patterns.
Review Results
See your strength score, entropy bits, estimated crack time, and improvement suggestions.
Key Features of This Password Strength Checker
✓Entropy Calculation
Measures password randomness in bits based on character set size and length for scientific strength assessment.
✓Crack Time Estimation
Estimates how long it would take to crack your password using brute force at 1 trillion guesses per second.
✓Pattern Detection
Identifies weak patterns like repeated characters, sequential numbers, and common passwords like "qwerty".
✓Character Variety Check
Evaluates use of uppercase, lowercase, numbers, and special characters for maximum complexity.
✓Actionable Suggestions
Get specific recommendations to improve weak passwords based on detected issues.
Frequently Asked Questions About Password Security
What makes a password strong?
A strong password is at least 12 characters long and mixes uppercase letters, lowercase letters, numbers, and special characters. Avoid dictionary words, personal information, and patterns. Higher entropy (50+ bits) indicates better resistance to brute force attacks.
How long should a password be?
Security experts recommend at least 12 characters for important accounts. 8 characters is the absolute minimum, but 16+ characters provides excellent protection. Length matters more than complexity - a long passphrase is often stronger than a short complex password.
What is password entropy?
Entropy measures password randomness in bits. It's calculated as log2(character set size^length). A password with 60+ bits of entropy would take centuries to crack. Higher entropy means more possible combinations an attacker must try.
Are special characters necessary?
Special characters increase your character set from 62 (letters + numbers) to 94, adding about 0.5 bits of entropy per character. While helpful, length is more important. "correcthorsebatterystaple" is stronger than "Tr0ub4dor&3" despite having no special characters.
How often should I change my passwords?
Modern guidance says only change passwords if you suspect a breach. Frequent changes lead to weaker passwords. Instead, use unique passwords for each account (a password manager helps), enable two-factor authentication, and monitor for breaches.
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