Password Strength Checker

About this tool

Checks a password against several common strength factors — length, character variety, and easily guessed patterns — and gives specific feedback on what would make it stronger. Nothing is sent anywhere; the password never leaves your browser, and it isn't stored anywhere either.

Frequently asked questions

What makes a password "strong" here?

Primarily length, plus a mix of uppercase, lowercase, numbers, and symbols. Length matters the most — a long passphrase is often stronger than a short, complex-looking password.

Does this check against known leaked password lists?

No — that would require sending the password to an external service, which this tool intentionally never does. It only checks structural patterns like length, repetition, and simple sequences (like "1234" or "abcd").

Is my password stored or logged anywhere?

No — everything happens locally in your browser's memory and disappears when you leave or refresh the page.