Security Tools
Password Strength Checker
Estimate password entropy and common weaknesses locally. The password never leaves this tab.
Your information is processed in your browser and is not uploaded to our servers.
Password
Estimate
Type a password to analyse it locally.
About this tool
Strength is a local heuristic: estimated entropy ≈ length × log2(charset size), plus simple pattern and common-password checks. It is not a breach database.
How to use
- Type a password.
- Read the rating and issues. The field is not submitted.
Formula and methodology
Charset size is 26+26+10+33 depending on classes present. Common passwords score 0.
Worked example
“password” is flagged as a known weak password even if it were long enough.
Frequently asked questions
Is the password uploaded or stored?+
No. Never. There is no network call and no persistence.
Why not use Have I Been Pwned?+
That would transmit a hash. This page stays fully offline by design.
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