Password Strength Evaluator
Measure password entropy, estimated crack time, and structural security.
Runs entirely in your browser — your data is never uploaded to any server.
How it works
- Enter passwordType or paste password
- Calculate entropyEvaluates character space & length
- Read assessmentSee entropy bits and strength
What this tool does
- Entropy bits calculation
- Estimated crack time
- Zero server transmit
Frequently Asked Questions
Yes. The evaluation runs 100% locally in JavaScript. Nothing is transmitted over the network.
Privacy and security
Your input is processed by JavaScript running inside your browser. Nothing you paste is sent over the network, logged, or stored — which is what makes this safe to use with production data. If you want to check this yourself: open your browser’s developer tools, switch to the Network tab, and use the tool — you will see no request carrying your file or input leave the page.