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Password Entropy Meter & Brute-Force Estimator
Just how strong is that password?
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About Password Entropy Meter & Brute-Force Estimator
Measure password entropy in bits and estimate brute-force time. This tool never sends your password anywhere.
📐 Methodology & Reference Accuracy:
Calculations, formulas, and conversions execute locally in your web browser. Output models are benchmarked against official reference standards and updated for 2026.
🔒 This tool runs entirely in your browser. Nothing is uploaded or stored.
Background reading: Password Entropy on Wikipedia. More: all developer tools.
Frequently Asked Questions about Password Entropy Meter & Brute-Force Estimator
How do I use the Password Entropy Meter & Brute-Force Estimator?
Open the Password Entropy Meter & Brute-Force Estimator and use the controls in the workspace below: just how strong is that password?. Results appear instantly in your browser, with nothing to install, sign up for, or pay for.
Is the Password Entropy Meter & Brute-Force Estimator free?
Yes. The Password Entropy Meter & Brute-Force Estimator is completely free, like every tool in the PrimeFreeTools library. There are no accounts, subscriptions, or usage limits.
Does the Password Entropy Meter & Brute-Force Estimator store or share my data?
No. The Password Entropy Meter & Brute-Force Estimator runs with JavaScript in your browser, so what you enter never leaves your device and nothing is stored on a server.
What can I use the Password Entropy Meter & Brute-Force Estimator for?
Measure password entropy in bits and estimate brute-force time. This tool never sends your password anywhere. You will find it grouped under Developer Tools together with 78 other free tools on the PrimeFreeTools homepage.
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Sep 6, 2026
Password Strength, Honestly Measured: Entropy Beats Rules
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