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Password Strength Checker Online - Free

Get a transparent strength estimate based on length and character classes. The password is never transmitted.

Password Strength Checker

Estimate password entropy locally

Ready. Your input is processed locally in this browser.

How to use the Password Strength Checker

  1. Enter a password.
  2. Review length, character classes and estimate.
  3. Do not paste passwords from active accounts into public computers.

Frequently Asked Questions

Is the password stored?

No.

Is the score a guarantee?

No. Real-world security also depends on breached-password databases and authentication controls.

What strength means here

The estimate is based on length and the kinds of characters used. Length matters most: a long passphrase of several unrelated words is usually stronger and easier to remember than a short, complicated string.

The estimate cannot know whether a password has already leaked or is a common pattern. Use a unique password for every account and turn on two-factor authentication where you can.

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