Password Strength Checker
Estimate password strength from length, character variety, and entropy, then convert to a rough offline crack time. Get instant suggestions to make passwords stronger. Runs entirely in your browser.
- • Enter a password to see analysis.
About Password Strength
Estimates strength from length, character variety, and entropy, then converts to a rough crack time assuming 10 billion guesses per second (offline fast attack). Generate a strong password with the Password Generator.
Secure & Private Client-Side
This tool runs entirely in your browser. No data is sent to any server, ensuring your information remains private and secure.
About Password Strength Checker
Estimate password strength from length, character variety, and entropy, then convert to a rough offline crack time. Get instant suggestions to make passwords stronger. Runs entirely in your browser.
Frequently Asked Questions
How is the crack time estimated? expand_more
Crack time assumes 10 billion guesses per second, a typical rate for offline attacks against a fast hash. Actual time depends on the hash function used and attacker hardware.
Is my password sent anywhere? expand_more
No. The analysis runs entirely in your browser; nothing is uploaded or stored.
Why does my long password still score low? expand_more
Common patterns like "password123" or repeated characters have low entropy despite their length. The tool flags these and suggests improvements.
How do I generate a strong password? expand_more
Use the [Password Generator](/tools/password-generator/) to create cryptographically random passwords. Pair it with this checker to confirm strength.
Should I store passwords in my browser? expand_more
Use a dedicated password manager. Browser storage is convenient but less secure than a manager with a strong master password.
Common Use Cases
- Sign-Up Forms: Show live feedback as users create accounts.
- Audits: Quickly judge whether existing passwords meet policy.
- Education: Demonstrate why length and variety matter for security.
- Policy Checks: Validate entropy before accepting a new password.