Free Online Diceware Passphrase Generator

1. Drag the Words slider to pick how many words you want (five to seven is a good sweet spot).
2. Optionally change the separator, capitalise each word, or append random digits.
3. Click Generate passphrase. The entropy preview tells you how strong it is.
4. Copy the phrase and store it in your password manager.

Diceware was invented by Arnold Reinhold in 1995: pick words from a known list using truly random draws so each word adds a fixed, calculable amount of entropy. With this tool's ~600-word common-English list, each word contributes about 9 bits of entropy — six words crosses 50 bits, seven crosses into bcrypt-resistant territory, and ten is essentially unbreakable by today's hardware.

The advantage over a symbol-soup password is purely human. People can actually remember `correct-horse-battery-staple-violet-sunrise` but not `H8#kQ2!nXq*L4z`. For accounts you'll type often without a password manager — your password-manager's master password, your disk-encryption phrase, your laptop login — that memorability is the whole point.

The generator uses `crypto.getRandomValues` with rejection sampling so word choices are unbiased even when the word-list size isn't a power of two. Generated phrases are not stored. Always pair a Diceware phrase with a password manager for the accounts that support it.