Password strength meter
Score a password for strength — length, character variety, and common weak patterns.
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Tool workspace
Scores length, character variety, and common weak patterns in your browser. Educational heuristic only — never uploaded.
Strength
- At least 12 characters
- Lowercase letter
- Uppercase letter
- Number
- Symbol
- No common weak patterns
Tips
Type a password to see a live strength estimate.
How it works
Heuristic (v1):
• Length bonuses at 8+, 12+, and 16+ characters
• Character-class bonuses for lowercase, uppercase, digits, and symbols
• Penalties for repeated runs, sequential runs (abcd / 1234), and keyboard walks (qwerty)
• Extremely common passwords score Very weak
Labels: Very weak (0) → Weak (1) → Fair (2) → Strong (3) → Very strong (4). Tips call out what is missing.
Empty or whitespace-only input clears the result—no error. Results are an educational estimate only — not a cracker, breach check, or security audit.
This tool does not send your password to a server.
Examples
- password → Very weak (common password)
- Tr0ub4dor&3 → mid-range (short for today’s guidance)
- Long unique passphrase with mixed classes → Strong / Very strong
Privacy
FAQ
Is my password uploaded?
No. Scoring runs entirely in your browser. We do not log what you type.
Is a “Very strong” score a guarantee?
No. This is a simple educational heuristic. Prefer a unique password from a password manager, and check breaches separately when needed.
Do you use zxcvbn or similar libraries?
No. The meter uses a clear in-house length/charset/pattern heuristic so you can see exactly what is scored.
Do I need an account?
No. All published tools work for guests without login.