Diceware Passphrase Generator - Free Online Tool
Diceware Passphrase Generator
Generate a Secure, Memorable Passphrase
Understanding Diceware Passphrases
Memorable & Strong
A sequence of random words is easier to remember and type than a random string of symbols, while still being very hard to guess.
Cryptographically Secure
Words are selected using your browser's secure random number generator, not a predictable pseudo-random source.
Visible Entropy Estimate
See an estimated entropy in bits so you can judge how many words you need for your security requirements.
Local Processing
Passphrases are generated entirely in your browser — nothing is ever sent to a server or logged.
How Many Words Do You Need?
More words mean more entropy and a harder-to-guess passphrase, at the cost of being longer to type. A common guideline is to aim for at least 60 bits of entropy for important accounts — check the entropy estimate above and increase the word count until you reach a level you're comfortable with.
Key Takeaways
- Adjustable Word Count: Choose between 4 and 10 words depending on how much security you need.
- Secure Randomness: Word selection uses the Web Crypto API rather than Math.random.
- Client-Side Only: All generation happens locally in your browser — no data is ever sent to a server.