Password Strength Checker

Check how strong your password is and get tips to improve it.

100% Private: Your password is checked locally in your browser. Nothing is sent to our servers.
Generate a Strong Password

Why Check Your Password Strength?

Instant Analysis

Get immediate feedback on your password strength with detailed metrics and entropy calculations.

Pattern Detection

Detects common patterns like sequences (123, abc), repeated characters, and keyboard patterns.

100% Private

All checks happen in your browser. Your password never leaves your device or gets stored anywhere.

Password Security FAQs

Learn more about password security.

1. How is password strength calculated?
Password strength is calculated based on length, character variety (uppercase, lowercase, numbers, symbols), and pattern detection. We also calculate entropy - the measure of randomness in bits.
2. Is my password sent to your server?
No! All password analysis happens entirely in your browser using JavaScript. Your password never leaves your device and is never transmitted over the internet.
3. What is password entropy?
Entropy measures the randomness of a password in bits. Higher entropy means more possible combinations. A password with 60+ bits of entropy is considered very strong and would take centuries to crack.
4. What makes a password weak?
Short length, using only one type of character, common patterns (123456, qwerty, password), repeated characters (aaa, 111), and dictionary words all make passwords weak and easy to crack.
5. How long should my password be?
We recommend at least 12 characters for regular accounts and 16+ characters for sensitive accounts like banking. Length is one of the most important factors in password security.
6. What is crack time estimation?
Crack time estimates how long it would take for a hacker to guess your password using brute force attacks. This assumes billions of guesses per second using modern hardware.

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