Password Strength Checker
Check password length, character variety and estimated guessing difficulty locally. The password is never sent to a server.
Set your values
Adjust the values, then calculate your result.
How to use Password Strength Checker
- Choose or enter the input shown above.
- Check the format, units and important limitations.
- Select “Check password strength” and review the result.
How password strength checker works
The estimate uses password length and the character groups present to calculate an approximate search space. Common patterns and known breached-password lists are not checked. Only length and character variety are used; the password value is not stored or transmitted.
Important limitations
This is a local educational estimate, not a breach database lookup. Avoid entering a password currently used for an important account; a unique generated password is safer.
Check the result before using it
Try the output in the app, device or workflow that requested it. Review the visible content and format before replacing an original file or sharing a generated link. Browsers and other services can handle edge cases differently, so keep a source copy when the input matters. This tool does not guarantee that a receiving service will accept every result.
Is the password sent to a server?
No. The strength estimate is calculated in your browser and the field is not submitted to a server.
Is input uploaded?
Processing takes place in your browser. This tool does not send your input or selected files to a conversion API.