Password Strength Estimator
Estimate password strength locally from length, variety and common patterns.
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How to use the Password Strength Estimator
- Open the Password Strength Estimator.
- Enter your input in the fields provided - results update as you type where practical.
- Use Copy or Download to take the result with you, or Reset to start again.
How it works
Scores entropy roughly as length x log2(character pool), then penalises repeats, sequences and common words. An estimate only - it cannot prove a password was never exposed.
Privacy note: this tool runs locally in your browser. Your input is not uploaded, stored in analytics, or placed in the page URL.
Frequently asked questions
Is the Password Strength Estimator free?
Yes. It is completely free, needs no account, and runs in your browser.
Is my data uploaded when I use the Password Strength Estimator?
No. Processing happens locally on your device. We do not upload your inputs, files or generated passwords.
How does the Password Strength Estimator work?
Scores entropy roughly as length x log2(character pool), then penalises repeats, sequences and common words. An estimate only - it cannot prove a password was never exposed.
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