How to use this tool

This tool scores how strong a password is, and tells you why — length, character variety, and whether it contains common patterns that crackers try first.

This analysis runs entirely in your browser. Your password is never sent to a server, stored, or logged.

⚠️ Please don't test a password you already use

Type a new, throwaway password you're considering, or a dummy one. If you type a real password you currently use, you're putting that secret into a text field on a shared device — and even though this tool sends nothing, a screen could be watched, a keylogger could be present, or your browser could keep an autocomplete copy. The safe habit: never type a live password into any checker, anywhere.

What makes a password strong

  • Length — the single biggest factor. 16+ characters is strong; 8 is the bare minimum.
  • Variety — mixing upper case, lower case, numbers and symbols.
  • Unpredictability — no dictionary words, no 1234 or password, no keyboard runs like qwerty.

A better approach: a passphrase

A long passphrase — four or more random words, like correct-horse-battery-staple — is easier to remember and hard to crack, because it's long. That's usually better than a short, complex one.

Use a password manager to generate and store unique passwords, and a strong passphrase for anything you must remember.