Password Strength & Entropy Checker
Analyze password complexity, entropy score in bits, and estimated time to crack with brute-force attacks.
1 How to Use the Password Strength & Entropy Checker
Type or paste your password into the inspection field.
View live entropy calculation (bits), security tier, and estimated brute force crack time.
Review the checklist of security requirements (length, uppercase, lowercase, numbers, symbols).
Adjust your password to reach 'Strong' or 'Very Strong' rating.
2 Technical Specifications
| Specification | Details & Capabilities |
|---|---|
| Entropy Formula | E = L × log2(R) where R is character set size |
| GPU Benchmark | 10 Billion guesses/second (Hashcat RTX 4090 standard) |
| Online Benchmark | 1,000 guesses/second (throttled login API) |
| Privacy | 100% Client-Side. Input never leaves browser memory. |
Trust and Privacy
100% Client-Side Privacy Guarantee
All calculations run directly in your local browser memory. Zero data is ever transmitted, logged, or stored on remote servers.
4 Frequently Asked Questions
Q. Is it safe to test my real password here?
Yes. This tool runs 100% inside your browser using client-side JavaScript. No network requests are made, and your input is immediately cleared upon closing the page.
Q. What is password entropy?
Entropy is a mathematical measure in bits of how unpredictable and difficult a password is to guess. Passwords with over 80 bits of entropy are virtually impossible to crack with modern supercomputers.