Is it safe to type my password into this website?

Yes. This tool operates 100% client-side in your web browser. No network requests are made and nothing is ever saved or sent to any server.

Updated: August 2026 • Verified v1.2

Password Strength & Shannon Entropy Meter

Developer ToolsSecurity

Local Browser Execution: Your input is processed locally in your browser and is not sent to UTL servers.

Shannon Entropy: E = Length * log2(Pool_Size); Combinations = Pool_Size^Length; Time = Combinations / (2 * 10^11)

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Understanding Your Results

Computes Shannon entropy ($E = L \log_2(R)$), identifies active character pools (lowercase, uppercase, digits, symbols), assigns a security tier, and estimates cracking time at 100 billion guesses/sec.

Practical Guidance & Next Steps

A password with 65+ bits of entropy cannot be brute-forced in a human lifetime using existing supercomputers. 128+ bits is cryptographically bulletproof.

What is this?

A cybersecurity utility that audits password strength through combinatorial Shannon entropy mathematics.

How does it work?

1. Enter a password to analyze. 2. View character pool detection, Shannon entropy in bits, and qualitative rating. 3. Review estimated cracking time on a high-speed GPU cracking cluster.

Why use it?

Reveals that password length provides exponentially greater security than just swapping letters for symbols.

Technical Scope & Calculation Limitations

Evaluates pure algorithmic combinatorial entropy.

Frequently Asked Questions

Entropy is calculated as $E = L \times \log_2(R)$, where $L$ is password length and $R$ is the size of the character pool (e.g. 26 lowercase + 26 uppercase + 10 digits + 33 symbols = 95 possible characters).

Windows Desktop & Widget Options