About Password Strength & Entropy Analyzer
Analyze password resilience against modern brute-force cracking attacks. Computes pool size, Shannon entropy (bits), and realistic crack time estimates for both high-end GPU cluster rigs (100 billion guesses/sec) and throttled web logins.
Key Capabilities & Features
- Realistic crack time estimates: Fast offline GPU cluster vs slow throttled online service
- Exact mathematical entropy calculation based on character pool diversity
- Detection of repetitive patterns, common dictionary patterns, and sequential runs
- Visual strength meter from Very Weak to Very Strong
- Actionable recommendations to enhance credential security
How to Use Password Strength & Entropy Analyzer
Enter Password
Type or paste the password you want to analyze.
Review Metrics
Examine entropy bits, character pool size, and estimated crack durations.
Address Weaknesses
Follow the actionable tips to strengthen credentials against brute-force attacks.
Privacy & In-Browser Execution Guarantee
Analyzed 100% locally in your browser RAM. Your password is never sent over the internet or evaluated by any external API.
Frequently Asked Questions
Is it safe to type my real password here?
Yes, because the code executes entirely in your browser memory with zero network requests. However, as general security hygiene, we recommend testing slight variations of master credentials rather than exact live production passwords.
How is offline GPU cracking speed estimated?
Calculations assume dedicated high-end GPU cluster rigs capable of 100 billion hash guesses per second testing against common cryptographic hashes like NTLM or MD5.
What is Shannon entropy in password analysis?
Shannon entropy measures bits of unpredictability based on the size of the available character pool and password length, calculating the theoretical search space for brute-force attacks.