Password Strength Checker
Free online password strength checker. Analyze entropy, crack time, and get suggestions to improve your passwords. 100% client-side. — runs 100% in your browser, client-side only. No data is sent to any server. Free to use, no account required.
Free
Client-Side
No Login
No Storage
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How to Use the Password Strength Checker
- Type or paste a password into the field.
- Strength score, entropy (bits), and estimated crack time are shown instantly.
- Follow the suggestions to improve weak passwords.
What makes a strong password?
- Length — 16+ characters is significantly stronger than 8
- Character variety — mix uppercase, lowercase, numbers, and symbols
- Unpredictability — avoid dictionary words, names, or keyboard patterns
- Uniqueness — never reuse passwords across sites
Privacy note: Your password never leaves your browser. All analysis is done client-side with zero network requests.