Password Strength Checker
Analyze password strength based on length, character variety, entropy, and common pattern detection. Your password never leaves your browser.
Your password is checked entirely in your browser. Nothing is sent to our servers.
Why use a Password Strength Checker?
Most people overestimate how strong their passwords actually are. A strength checker reveals real weaknesses — short length, missing character types, common patterns, or repeated characters — before an attacker exploits them. Pair this with our password generator to immediately create a stronger replacement, and use bcrypt to hash it safely for storage.
Real-time analysis
Entropy, character pool size, and crack time are computed instantly as you type — no server required.
Detailed checklist
See exactly which criteria your password passes or fails so you know precisely what to improve.
100% private
Your password never leaves your browser. Everything runs locally using JavaScript with no network calls.
Common password weaknesses & how to fix them
Understanding why a password is weak is the first step to fixing it. Explore the security tools category for more protection tools.
| Weakness | Why it's risky | Fix |
|---|---|---|
| Too short (<8 chars) | Brute-forced in seconds on modern hardware | Use 16+ characters minimum |
| Dictionary word | Dictionary attacks try millions of words per second | Add symbols, numbers, or use a passphrase |
| Keyboard walk (qwerty) | Predictable patterns are included in attack wordlists | Use a random generator instead |
| Sequential numbers (123) | Among the first patterns tried in any attack | Avoid sequential or repeated characters |
| Reused across sites | One breach compromises all accounts sharing that password | Unique password per account, stored in a manager |