How many words should I use?

At least 6 for important accounts. Each word multiplies combinations by the list size.

Is this as secure as a random password?

For equivalent entropy, yes. A 6-word passphrase (~39 bits) roughly equals an 8-character random password.

Can I use this as a master password?

Yes. Use 6-8 words. Easier to type and remember than equivalent random characters.

Why the EFF word list?

Designed to minimize confusion between similar-sounding words, making passphrases easier to communicate and less prone to typos.

Passphrase Generator

Free online passphrase generator. Diceware-style passphrase creator using cryptographically secure randomness. Human-readable, brute-force resistant.

Free online passphrase generator. Diceware-style passphrase creator using cryptographically secure randomness. Human-readable, brute-force resistant. Set the number of words (4-8) using the slider for your desired passphrase length. Choose a word separator: dash, space, or dot. Click "Generate" to create a new passphrase using crypto.getRandomValues(). Check the entropy score to understand brute-force resistance. Copy the passphrase to use for your accounts or password manager master key. Generates Diceware-style passphrases using a subset of the EFF word list. Each word adds ~6.5 bits of entropy via crypto.getRandomValues(). A 6-word passphrase has ~39 bits (~5 trillion combinations). 100% client-side.