Test Your Password Strength
Advanced security analysis with real-time feedback. Get comprehensive insights into your password's strength, vulnerabilities, and improvement suggestions.
🔒 100% Private - All analysis happens in your browser
Your password never leaves your device. No data is sent to any server.
See the Difference: Password Comparison
Compare passwords side-by-side to understand what makes them strong or weak
What Makes a Password Strong?
Strong passwords combine length (16+ characters), randomness (high entropy), and avoid common patterns like dictionary words, keyboard sequences, or repeated characters. Consider using passphrases made of random words instead of complex character substitutions.
Note: This comparison is educational and illustrative. Real-world password security depends on many factors including unique passwords per site, two-factor authentication, and secure storage. Test your actual passwords with the full checker above for comprehensive analysis.
Why Password Strength Matters
Weak passwords are the leading cause of data breaches and account compromises. Our advanced password strength checker uses industry-standard algorithms to analyze your password's resistance to various attack methods.
What We Analyze:
- Length & Complexity: Longer passwords with diverse character types are exponentially harder to crack.
- Pattern Detection: We identify common patterns like keyboard sequences, repeated characters, and predictable substitutions.
- Entropy Calculation: A measure of randomness and unpredictability in bits.
- Crack Time Estimation: How long would it take attackers with different resources to crack your password.
Frequently Asked Questions
Is it safe to check my password on this website?
Yes, absolutely! All password analysis happens entirely in your browser using JavaScript. Your password never leaves your device and is never sent to any server. For breach checking, we use k-anonymity protocol where only the first 5 characters of your password hash are sent, making it impossible to reverse-engineer your actual password.
What makes a password strong?
A strong password is at least 16 characters long, uses a mix of uppercase, lowercase, numbers, and symbols, and doesn't contain dictionary words, keyboard patterns, or personal information. Consider using passphrases (4-5 random words) which are easier to remember but harder to crack.
How does breach checking work?
We check your password against a database of over 10 billion breached passwords using the Have I Been Pwned API. Your password is hashed locally using SHA-1, and only the first 5 characters of the hash are sent to the server. The server returns all matching hashes, and your browser checks if your specific hash is in the list. This k-anonymity approach ensures your password remains private.
What's the difference between PassCheck Pro and SecurePass Pro?
PassCheck Pro analyzes existing passwords to test their security and provide educational feedback. SecurePass Pro generates new secure passwords when you need to create strong credentials. They're complementary tools - use PassCheck to test your current passwords, then use SecurePass to generate better ones if needed.
Need to Check Multiple Passwords?
Try our Bulk Password Audit tool to analyze up to 50 passwords at once. Get aggregate statistics, identify duplicates, and receive prioritized recommendations.
Try Bulk AuditValidate Against Compliance Standards
Test passwords against NIST, PCI DSS, HIPAA, or custom policies. Perfect for businesses, IT teams, and compliance professionals who need to ensure passwords meet organizational requirements.
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Explore our education hub to understand entropy, attack methods, password vs passphrase comparisons, and best practices for password security.
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