does my password suck?

Enter your password, and we'll tell you how much it sucks (or doesn't).

Entropy can easily be calculated manually, but that number only holds true if the password was randomly generated. In practice most passwords are made by humans (even if it's just your master password). So this tool estimates the real-world entropy of human-made passwords using Dropbox's ZXCVBN. No data is sent over the network. Trust me.