Password Strength Checker
Analyze the strength of your passwords and get feedback on how to improve them.
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About Password Strength Checker
Audit the security of your passwords with our advanced strength checker. Instead of just counting characters, we analyze entropy, common patterns, and dictionary words to provide a realistic estimate of how long it would take a hacker to crack your password.
How to Use
- Enter your password or passphrase into the audit field.
- Review the 'Strength' rating (Weak to Very Secure).
- Check the 'Time to crack' estimate for various brute-force scenarios.
- Follow the 'Security Suggestions' to fix vulnerabilities like common words or sequential patterns.
Common Use Cases
- Testing new passwords before setting them on sensitive financial or social accounts.
- Learning the principles of strong password design (entropy vs length).
- Finding vulnerabilities in frequently used passphrases that might be prone to dictionary attacks.
Technical Details
Powered by the industry-standard zxcvbn library, which uses pattern matching and conservative entropy calculation to provide realistic security assessments.
Frequently Asked Questions
- Is it safe to type my real password?
- Yes. This tool is client-side only. We never transmit your password or audit results to any server.
- What makes a password 'Strong'?
- A strong password avoids common patterns, utilizes high entropy (randomness), and is long enough to resist modern brute-force hardware.
100% Private & Secure
This tool runs entirely in your browser using client-side technology. Your files and data are never sent to a server, ensuring 100% privacy and speed.