The Passphrase Generator creates strong, memorable passwords by combining randomly selected words from a large dictionary. Inspired by the famous "correct horse battery staple" approach, passphrases offer excellent security because their length and randomness make them extremely difficult to crack by brute force — yet they are far easier for humans to remember than a string of random characters. Choose how many words, pick a separator (space, hyphen, underscore, or period), and optionally capitalize each word. All generation runs client-side using the Web Crypto API, so your passphrase is never sent to any server.
About Passphrase Generator
A passphrase is a password composed of multiple random words strung together. Security researchers have shown that a four- to six-word passphrase drawn from a sufficiently large word list provides strong entropy while remaining human-readable. This generator uses a curated English word list and the browser's cryptographically secure random number generator (crypto.getRandomValues) to ensure each word selection is truly random. The result is a password that is both strong against automated attacks and practical enough to type from memory when needed.
How to Use Passphrase Generator
- Set the number of words — four words is a good minimum; five or six adds significant strength.
- Choose a separator (hyphen, space, underscore, or period) to place between words.
- Toggle Capitalize words if your account requires uppercase characters.
- Click Generate passphrase. Copy the result and store it in your password manager.
Key Features
- Uses cryptographically secure randomness (Web Crypto API) for word selection
- Large built-in word list for high entropy per word
- Customizable word count, separator, and capitalization
- Produces memorable passwords that are easy to type
- Completely browser-based — no server interaction, no data stored
When to Use This Tool
- Creating a new master password for a password manager
- Setting up passwords you might need to type manually (e.g. device logins)
- Replacing weak or reused passwords with strong, memorable alternatives
- Generating temporary passphrases for shared accounts or WiFi networks
- Any scenario where you want both strength and memorability
Technical Details
Entropy depends on the word list size and word count. With a list of several thousand words, each word adds roughly 11–13 bits of entropy. A four-word passphrase yields approximately 44–52 bits; six words reach 66–78 bits, comparable to a randomly generated 12-character alphanumeric password. Words are selected using crypto.getRandomValues() mapped uniformly to the word list. For stronger random-character passwords, try the Password Generator. To measure the entropy of any password, use the Password Entropy calculator.
Conclusion
Passphrases strike the ideal balance between security and usability. This free, browser-based Passphrase Generator builds strong, easy-to-remember passwords from random words — powered by cryptographic randomness and requiring no server access or sign-up.