A tool for making strong, memorable passphrases.

DicePhrase main screen

About DicePhrase

DicePhrase is a browser extension that helps you easily create strong, memorable passphrases, such as FragrantRenewedAnyoneBakedPossum or BazookaClangUnstuckTransferQuoteJokingly, by rolling six-sided dice to randomly select from a set of thousands of words. This system creates passphrases that are more unguessable than if you were to pick words on your own or trust the computer to generate words automatically.

It's based on best practice strategies for creating passphrases by the Electronic Frontier Foundation, security technologist Micah Lee, and the Diceware project.

Passphrases, not passwords

Long, random passphrases are more secure because they're more difficult for an attacker to guess than simple passwords. While a password like Batman1989 is too easily guessed and &1KJl6a8y$g*01W}i21!MZ is too hard to remember, random passphrases like DonutConfinedCurveHurricaneJuggleWidget are strong and memorable.

Passphrases don't need to be personal to be memorable. Personal things like birthdays, addresses, anniversaries, names, lyrics, books, movies, etc. are not very secret; anyone can find out your address, pet's name, or favourite songs. Picking words randomly ensures your passphrase is unbiased and unpredictable.

DicePhrase passphrase screen

Roll the dice

You do five dice rolls to randomly select each word for your passphrase, so if you need a 6-word passphrase, that's 30 dice rolls. Input the numbers into DicePhrase, which will then use them to look up corresponding words in a table of 7776 possible words to generate your new passphrase. With each additional word, the chances that anyone could ever guess your passphrase become exponentially smaller.

Why use dice?

Dice are a more reliable and transparent source of randomness than choosing numbers yourself or having a computer generate random numbers. Humans tend to have too much bias when attempting to make random selections, and it's hard to prove that the complex systems used by computers for creating randomness are truly unpredictable. If you don't need such a high level of unpredictability, DicePhrase can generate pseudo-random numbers without dice when you click "Skip" in the main window, although using dice is still recommended.

When to use passphrases

Passphrases are ideal when used to encrypt information. They're perfect as the master password for a password manager so you only need to remember a single strong passphrase. They're also great for securing WiFi networks, disk encryption, PGP or SSH encryption keys, and any other encryption system. Use them whenever you need memorable authentication in general.

For online accounts, having strong passphrases is good, but may not be enough protection from attackers who use techniques like phishing to steal credentials. You should enable Two-Factor Authentication, which adds a second step to the login process, and consider saving unique passphrases for each account in a password manager.

Secure design

DicePhrase is built to protect the confidentiality of your passphrases. Most importantly, passphrases aren't saved, they're automatically cleared 10 minutes after they've been created (you should memorize them or save them in a password manager application). DicePhrase is also free and open source software, so anyone can inspect the code to verify its safety. You can read more about DicePhrase's security design, as well as how to report bugs.

Get support

DicePhrase includes built-in documentation about how to use it and to help you understand passphrase security. Access it by clicking the icon in DicePhrase, or view it online.

If you need any additional support, please get in touch.


DicePhrase requires Google Chrome, Chrome OS, or Chromium, or Mozilla Firefox. Make sure you're running the latest version of your browser in order to have the best security protection.

At least one six-sided die is needed to create random passphrases. If you don't have any dice available, DicePhrase can generate pseudo-random numbers instead, although rolling dice is still recommended.


DicePhrase is copyright © 2020 Lucas Bleackley Petter.


DicePhrase is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

DicePhrase is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.


Permission is also granted to copy, distribute and/or modify DicePhrase's documentation under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".

Credit to third-party software used in DicePhrase: