Passphrase generator

A passphrase is several unrelated words picked at random. It is easier to remember and to type than a random string of the same strength, which matters for the handful of passwords you have to know by heart — your device login, your password manager’s master password, your disk encryption.

The strength comes only from the randomness of the choice, not from the words themselves. Each word contributes log2(list size) bits, so a five-word phrase from a list of thirty thousand words is about seventy-four bits — comfortably stronger than a twelve-character random password. The meter here reads the actual list in use rather than quoting a number from somewhere else. One warning worth taking seriously: choosing the words yourself destroys this entirely. People reach for related words, and a phrase like "correct-horse-battery-staple" is now in every cracking dictionary precisely because it became famous.