Password Security & Entropy Analyzer
Calculate password entropy, estimate crack times against offline GPU clusters and online throttling, and generate cryptographically strong passwords locally with Web Crypto API.
Password Security & Entropy Analyzer
Evaluate the cryptographic strength and entropy of your passwords locally without sending any data over the network, and generate secure random passwords.
Estimated Time to Crack
Pattern & Security Heuristics
Cryptographic Password Generator
Powered by window.crypto.getRandomValues (CSPRNG)
How to Analyze Password Strength & Generate Secure Passwords
- 1
Type or paste a password into the input field to immediately calculate its Shannon entropy and character pool size.
- 2
Inspect the estimated cracking times across online rate-limited, offline slow hash (bcrypt), and high-speed GPU cluster attack models.
- 3
Review the heuristic checklist to ensure your password avoids predictable sequences, dictionary words, and repeated patterns.
- 4
Use the built-in Cryptographic Generator to create high-entropy passwords with custom length and character rules using window.crypto.getRandomValues.
Password Security & Entropy FAQ
What is password entropy and how is it calculated?
Password entropy measures the unpredictability and information density of a password in bits. It is calculated as E = L * log2(R), where L is the password length and R is the size of the character pool.
Is my password sent to your server when tested?
No. All entropy math, pattern heuristic checks, and password generation execute 100% inside your browser using client-side JavaScript and the Web Crypto API. Zero data leaves your computer.
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