Password Strength Checker

The Password Strength Checker is a free, offline security tool that instantly analyzes any password and rates its strength from Very Weak to Very Strong. It evaluates length, character variety, and the presence of common patterns to give you a realistic score — and crucially, it estimates how long a modern computer would take to crack it through brute force.

Unlike oversimplified strength meters that only check length, our tool simultaneously evaluates six independent security requirements, flags common dictionary words and keyboard patterns, and calculates a crack-time estimate based on 10 billion guesses per second — representative of a modern dedicated GPU cracking rig.

Everything runs entirely in your browser. Your password is never transmitted to any server, stored in any database, logged in any analytics system, or accessible to any third party. It is ephemeral by design.

Checking your password strength takes just a moment:

1. Type or paste the password you want to analyze into the input field.
2. Toggle 'Show' to reveal the characters if you need to proofread your entry.
3. Review the color-coded strength meter and label (Very Weak → Very Strong).
4. Check the Estimated Crack Time to understand the real-world security level.
5. Scroll down to the Password Requirements checklist to see exactly which criteria are passed and which are failing.
6. Read the Suggestions box for actionable advice on how to improve weak passwords.

Once you have a strong password, use a trusted password manager (like Bitwarden, 1Password, or KeePass) to store it securely — never write it down or reuse it across multiple sites.

Password strength analysis is a critical step in personal and organizational digital security:

• Personal Account Security: Verify that passwords for email, banking, and social media accounts are strong enough to resist modern brute-force and dictionary attacks.
• Corporate Password Policies: IT administrators can use this tool to demonstrate to employees what makes a password compliant with NIST 800-63B and organizational security policies.
• Password Manager Audits: Evaluate the strength of existing passwords before migrating them to a password manager, identifying weak entries that should be changed first.
• Security Training: Use as an educational demonstration tool in cybersecurity awareness training to show employees why complexity matters.
• Developer Testing: Quickly test the strength of passwords generated by your application's password creation API or hashing schemas during development.