Password Strength Checker
Test your password strength instantly. See entropy bits, estimated crack time, and a checklist of security requirements — all calculated in your browser with zero data sent anywhere.
Nothing is sent — all analysis happens in your browser.
Security requirements
- At least 8 characters
- At least 12 characters
- Uppercase letter (A-Z)
- Lowercase letter (a-z)
- Number (0-9)
- Symbol (!@#…)
What makes a strong password?
A strong password should be at least 12 characters long and combine uppercase letters, lowercase letters, numbers, and symbols. Entropy — measured in bits — is a mathematical score of unpredictability. The higher the entropy, the more guesses an attacker needs.
How crack time is estimated
Crack time is estimated assuming 1 billion guesses per second, which represents a typical online brute-force attack. Offline attacks with specialised hardware can be orders of magnitude faster — making long, complex passwords or passphrases essential.
Privacy
All analysis happens locally in your browser using JavaScript. Your password is never sent to any server.
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