Password Strength Checker

7 tools

Check the strength and entropy of your own password.

100% client-side — nothing you process is ever uploaded

A complete password toolkit — generate strong random passwords, memorable passphrases, PINs, API secrets, and usernames, check the strength of your own password, or generate many at once. Everything runs locally in your browser using a cryptographically secure random source.

Password Generator Passphrase Generator Password Strength Checker PIN Generator Bulk Generator Username Generator Secret/API Key Generator

Enter a password to check

How to use this tool

1Type or paste a password.
2See its estimated strength and entropy.
3Follow the suggestions to improve it.

Frequently asked questions

Is my password sent anywhere?

No — the check runs entirely in your browser; nothing is transmitted or stored.

How is strength estimated?

From character-set entropy, with penalties for common passwords, repeated characters, and sequential patterns — not a database lookup.