Password Entropy & Brute-Force Crack Analyzer
Analyze password strength using Shannon entropy and combinatorial mathematics. Determine exact bits of entropy, character pool size (charset), and estimated cracking time against modern GPU clusters—with guaranteed 100% on-device privacy.
How to Use Password Entropy & Strength Analyzer
Type Password
Input or generate a candidate password in the private test field.
Inspect Entropy Score
View total bits of entropy (e.g., 64 bits = Good, 80+ bits = Cryptographically Strong).
Review Crack Times
Examine realistic crack times against single computers vs high-performance GPU hash cracking clusters.
About Password Entropy & Strength Analyzer
Password strength is determined primarily by mathematical entropy (measured in bits) rather than mere length. Each additional bit doubles the number of possible guesses required. A password with 80 bits of entropy requires approximately 1.2 × 10²⁴ guesses, rendering brute-force attacks computationally impossible.
Key Features
- Shannon Entropy Formula: E = L × log2(R), where L is length and R is character pool size
- Crack time estimations modeled against consumer PCs (10M guesses/sec) and offline 8x RTX 4090 clusters (100B guesses/sec)
- Dictionary word and common pattern penalty detection (e.g. 'password', sequential '12345')
- 100% strictly client-side: your keystrokes never leave your browser sandbox
- Visual color-coded security gauge from Very Weak to Military Grade
Frequently Asked Questions
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