Password Strength Checker

Check how strong a password is, its entropy and estimated crack time. Runs 100% in your browser; nothing is sent. 🔒 Runs in your browser

Results

How to use the Password Strength Checker

  1. Paste or type your text in the box (or open a .txt file).
  2. The counts update instantly as you type.
  3. Use the numbers to hit your word, character or length target.

About this tool

Check how strong a password is, its entropy and estimated crack time. Runs 100% in your browser; nothing is sent. It is part of the free Passwords & Security collection on Online Tools Harbor. Everything happens locally in your browser, so it is fast and private.

Frequently asked questions

Is the Password Strength Checker free?

Yes. The Password Strength Checker is completely free to use, with no sign-up and no limits on normal use.

Is my data safe?

Yes. This tool runs entirely in your web browser using JavaScript. Your text is never uploaded to our servers.

Does it work on mobile?

Yes, it works in any modern browser on phones, tablets and computers. No app to install.

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