Password Strength
A local entropy estimate.
Ctrl+Enter runs. Ctrl+Shift+Backspace clears.
The estimate stays in this browser. It is not a password manager.
Export and import are available after you sign in. Sign in
Nothing is uploaded. The score is an estimate, not a guarantee.
About this tool
Check whether a password is long and varied enough before you use it. The tool estimates entropy from the length and the kinds of characters, and gives a simple score.
How to use it
- 01
Type the password.
- 02
Read the score, the bits of entropy and the length.
- 03
Make it longer or more varied until the score is strong.
Frequently asked questions
Is my password sent anywhere?
No. The estimate is calculated in your browser, and the tool stays out of account history unless you allow it.
Is a strong score a guarantee?
No. It is an estimate; a password reused elsewhere or found in a leak is weak regardless of its score.