Passphrase generator
Generated in your browser · never sent, never stored
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.
How to generate a passphrase
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.
Questions
Four is the practical minimum, five is comfortable, six for a master password or disk encryption.
You can, and it ruins the point. Human choices cluster around related, common words and are far easier to guess than the meter would suggest.
At the same entropy, identical. The maths does not care. The advantage is that you can remember a strong passphrase and cannot remember a strong random string.
Length limits and rules demanding symbols. Turn on the number option, or use a random password for those and save passphrases for what you type by hand.
It is the English dictionary this site already ships for its word tools, filtered to words of four letters and up. The word count is shown so the entropy figure can be checked.
No. It is downloaded to your browser and the choosing happens locally, like everything else here.