Password Strength Validator
Paste a password to check whether it is valid — complete with the reason if it is invalid and a component breakdown if it is valid. Everything is processed on your device.
Everything runs in your browser. Your data is never sent to our servers.
Example
Example Input
Tr0ub4dour&3
Example Output
✓ Strong — ~72 bits entropy
How to Use
- 1Paste the a password you want to check into the input box.
- 2If the tool offers extra options (e.g. dialect, flags, or variant), set them as needed.
- 3Click Validate (or press Ctrl+Enter).
- 4Read the result badge — VALID, INVALID, or VALID with a warning — along with the details and the list of issues, if any.
About Password Strength Validator
Password Strength Validator estimates a password's strength from its length and character variety (upper/lower, digits, symbols), computes the entropy in bits, and gives a tier from "very weak" to "very strong". It also flags weak patterns like digits-only or repeated characters.
The entropy estimate is character-pool based — not a guarantee against dictionary attacks. The password is processed entirely in the browser and never sent anywhere.
FAQ
Is my data sent to a server?
No. All validation runs in your browser with JavaScript. Nothing is uploaded, logged, or stored on our servers — safe for sensitive data.
How is this validator different from a parser or formatter?
A validator answers one question: is this input correct/valid? It returns a valid/invalid badge with the reason. A parser breaks input into its components, and a formatter tidies its layout. Use a validator when you just need to confirm something is sound before using it.