Password Strength Checker
Free online password strength checker that runs entirely in your browser.
How the Password Strength Checker works
The Password Strength Checker works on Password to test and shows the result as you type. The same input always gives the same answer — refresh the page and you will see exactly the same figure.
Formula used
Password Strength Checker is computed by the formula below, using the inputs you provide.
Inputs used: Password to test.
Worked example
Take the default example — password to test of Tr0ub4dor&3:
- entropy: 72
- length: 11
- charset: 94
Frequently asked questions
- Is the Password Strength Checker free?
- Yes. There is no signup, no usage limit and no watermark — the checker runs entirely in your browser.
- Does the Password Strength Checker store or send my data?
- No. Every calculation happens locally in the page, so the numbers you type are never uploaded or logged.
- Does it work on a phone and offline?
- Yes — the page is a single lightweight file that adapts to any screen size. Once it has loaded it keeps working without a network connection.
- What inputs does the Password Strength Checker need?
- Password to test. Change any of them and the result updates instantly.