Password Entropy Checker
See a password's strength in bits of entropy and an estimated time to crack. Everything is calculated locally in your browser.
Runs entirely in your browser. Nothing you type here is transmitted, logged, or stored. There is no server to send it to. Open your developer tools and watch the network tab if you want to confirm it.
Nothing is sent anywhere and nothing is stored. Still, do not test a password you are actively using: test its pattern instead.