What factors does it consider beyond length?

Character variety (uppercase, lowercase, numbers, symbols), common patterns, and predictability all factor into the strength assessment, not just how many characters the password has.

Is my password sent anywhere to be checked?

No, the entire check runs locally in your browser — your password is never transmitted anywhere.

Does a high strength score guarantee the password hasn't been leaked in a data breach?

No, strength and breach exposure are different things — a strong, complex password can still have appeared in a past data breach if it's been reused elsewhere.

Does Password Strength Checker upload my files to a server?

No. Password Strength Checker runs entirely in your browser using on-device processing, your files never leave your device.

Password Strength Checker

Check how strong a password is, checked entirely in your browser.

Runs in your browser

Checked entirely in your browser, your password is never sent anywhere.

About this tool

Judging whether a password is actually strong takes into account more than just length — character variety, common patterns, predictability — factors that aren't obvious just by looking at a password. This tool checks how strong a password is, evaluated entirely in your browser so the password itself is never sent anywhere, giving you an objective strength assessment instead of a guess.

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