Diceware Passphrase Generator
Generate memorable high-entropy passphrases from the EFF 7,776-word list.
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What is Diceware Passphrase Generator?
The Diceware Passphrase Generator creates strong passwords made of real words. It picks each word from the EFF large wordlist (7,776 words) using either your browser's crypto-secure random number generator or your own physical dice rolls. The result is a passphrase like "caper-citify-impel-torso" that is far easier to remember than "k9#Xv!2mQz$p" while being mathematically stronger.
Key Benefits
- Memorable: real words stick in human memory far better than symbol soup
- Quantified strength: live entropy and crack-time estimates for every length
- Trust your own entropy: physical dice mode removes all software from the trust chain
- Private by design: no network calls, no logs, nothing leaves your device
Common Use Cases
- •Master password for your password manager (use 6+ words)
- •Device encryption passphrases and disk encryption keys
- •Wi-Fi and router admin passwords you type on TV remotes or consoles
- •Backup and recovery codes you only see once a year
- •Shared team secrets that must survive being read aloud over the phone
How to Use the Diceware Passphrase Generator
- Choose word count: Pick how many words you want. Six words (~77 bits) is a good default; use eight or more for high-value accounts.
- Pick a randomness source: Use the crypto-secure generator for convenience, or switch to physical dice mode and roll five dice per word yourself.
- Generate the passphrase: Click Generate (or Use dice rolls). The words appear with per-word numbering, entropy, and an estimated offline crack time.
- Copy and store safely: Copy the passphrase to your password manager, or download it as a text file, then clear the screen when done.
Key Features
- Full EFF large wordlist of 7,776 words bundled offline
- Crypto-secure randomness via the Web Crypto API
- Physical dice-roll mode for user-supplied entropy
- Live entropy and offline crack-time estimates
- 3 to 20 word lengths with separator options
- Copy, download, and regenerate in one click
Frequently Asked Questions
What is Diceware?
Diceware is a method for building passphrases from true randomness. You roll five dice to pick each word from a numbered wordlist, producing a sequence that is random yet easy for humans to memorize. This tool automates the lookup using the EFF large wordlist of 7,776 words.
How strong is a Diceware passphrase?
Each word from the 7,776-word EFF list adds about 12.9 bits of entropy. Five words give ~65 bits, six words ~77 bits, and eight words ~103 bits. Six or more words is considered strong against offline attacks by modern GPUs.
Is it safe to generate passphrases in my browser?
Yes. This tool runs entirely client-side: the wordlist is bundled into the page and randomness comes from the browser Web Crypto API. Nothing is transmitted, logged, or stored on any server.
Can I use real dice instead of the browser generator?
Yes. Switch the randomness source to physical dice, roll five dice per word, and type the five-digit groups. The tool maps each group to the exact same word as the official EFF lookup table.