Security Tools
💪 Password Strength Checker
Evaluate how strong and secure your password really is. Everything runs in your browser — your password is never sent anywhere or stored.
Security Checklist
- At least 8 characters
- At least 12 characters (recommended)
- Contains uppercase letters
- Contains lowercase letters
- Contains numbers
- Contains symbols
- No common sequences (123, abc, qwerty…)
- No repeated characters in a row (aaa, 111…)
- Not a commonly leaked password
Technical Details
About the Password Strength Checker
This free online tool analyzes a password entirely in your browser using JavaScript — nothing is ever sent to a server, logged, or stored. The analysis runs locally and disappears the moment you close or refresh the page.
- Entropy — measures the theoretical randomness of your password in bits. Higher entropy means more possible combinations an attacker would need to try.
- Character variety — checks for a mix of uppercase, lowercase, numbers and symbols, which increases the character pool size.
- Common patterns — detects sequences like "123456", "abcdef" or "qwerty" and keyboard patterns that are easy to guess.
- Repeated characters — flags passwords with characters repeated in a row, like "aaa" or "111".
- Estimated crack time — a rough estimate of how long a modern offline attack would take to brute-force your password.
For best security, use a unique, randomly generated password for every account, store them in a trusted password manager, and enable two-factor authentication wherever available.