Free · Use a stricter check for your vault

Master Password Strength Checker

Check a password-manager master password with a high score and long-length target.

  • zxcvbn-ts local estimate
  • Password never leaves this tab
  • Password-free reports

Check master password

The checker loads on this device. Your password is never uploaded or put in a report.

1
Enter a test choiceThe field stays in this tab
Private by designRuns with zxcvbn-ts in this browser
2
Read the safe resultReady when you are
Your score will appear here

The result shows strength and patterns, never the password itself.

Three simple steps

How to use it

  1. Enter it only on this trusted device.
  2. Aim for a long unique passphrase.
  3. Never paste it into an unknown website.

Your password stays on this device

zxcvbn-ts checks the password inside this browser tab. Bookify does not upload, save, or log it. Results and downloads leave the password out. Crack times are estimates, not guarantees.