Free · Compare a password before and after a change
Password Improvement Lab
Add a private change and see whether it truly raises the guess score.
- zxcvbn-ts local estimate
- Password never leaves this tab
- Password-free reports
Compare improvement
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
- Enter a starting password.
- Add a longer private change.
- Compare the real score instead of guessing.
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.