Is Password Strength Checker free?

Yes, Password Strength Checker is completely free to use with no signup required.

Does Password Strength Checker send my data to a server?

No. Password Strength Checker runs entirely in your browser using client-side JavaScript. Your data never leaves your device.

Check password strength with an entropy score, estimated crack time, and specific weaknesses — checked locally, never transmitted.

DevTab

Never leaves your browser

Estimate entropy, crack time, and common weaknesses in a password client-side.

Password to check

StrengthStrong

Entropy72 bits

Est. crack time150 centurys

Feedback

Acceptable Strength Checked entirely in-browser — never transmitted anywhere.