Password Strength Evaluator
Analyze entropy, cracking time estimates, and pattern vulnerabilities locally. Your password is never transmitted.
How We Calculate Strength
Strength is primarily a function of Entropy (measured in bits). It represents the size of the search space an attacker must traverse.
| Entropy | Verdict |
|---|---|
| < 40 bits | Catastrophic |
| 40 - 60 bits | Weak |
| 60 - 80 bits | Reasonable |
| > 80 bits | Strong |
Common Mistakes
- Predictable Patterns: "Password123!" has high theoretical entropy but zero practical entropy due to dictionary and pattern predictability. Algorithms like zxcvbn handle this via heuristics.
FAQ
Q: Is my password sent to a server?
A: No. The math running here executes 100% locally in your browser via Javascript.