Passphrase Generator
Generate memorable secure passphrases from the EFF large wordlist. Configure the number of words, casing style, separator, and optional trailing number, then get an entropy estimate for the generated passphrase.
Uses the EFF large wordlist for diceware-style random word selection.
Defaults to four lowercase words separated by hyphens.
Supports lowercase, uppercase, titlecase, and camelcase casing styles.
Supports custom separators, including hyphen, underscore, space, or no separator.
Can append a random digit and reports estimated entropy.
How to Use
Choose the number of words, or use the default of 4
Select a casing style such as lowercase or titlecase
Choose a separator such as hyphen, underscore, space, or none
Optionally add a random digit
Generate and copy the passphrase into a password manager
Security
- Create memorable master passwords
- Generate Wi-Fi passwords humans can type
- Create recovery phrases for internal tools
Usability
- Make passwords easier to read aloud
- Reduce transcription errors
- Create strong but memorable credentials
| Original Text | Result |
|---|---|
{"num_words":4} | four-random-eff-words with entropy estimate |
{"num_words":5,"caps":"titlecase","separator_type":"-"} | Five-Titlecase-Words-Like-This |
{"num_words":4,"caps":"camelcase","separator_type":"","numbers":true} | camelCasePassphrase7 |
Security Workflows
- Password managers
- Wi-Fi credentials
- Team onboarding
- Admin account setup
Passphrases are easier for humans to remember and type than random symbol-heavy passwords of similar strength.
Increasing the word count usually improves security more predictably than adding punctuation rules.
Use separators when humans need to read or transcribe the passphrase; use camelcase or no separator when a system disallows spaces or punctuation.
Use at least four words for moderate security and more words for high-value accounts.
Store generated passphrases in a password manager even if they are memorable.
Do not modify generated words into predictable substitutions unless you understand the entropy impact.
Frequently Asked Questions
Find answers to common questions about our tools and services.
Understanding Passphrase Generator
A passphrase is a sequence of words or other text used to control access to a computer system, program, or data. While structurally similar to a traditional password, a passphrase is usually much longer and composed of multiple distinct words. The concept of using random words for credentials originated with the "Diceware" method, where users roll physical dice to select words from a numbered dictionary. In modern security contexts, passphrases have emerged as the premier standard for human-memorizable credentials because they bridge two conflicting requirements: extremely high brute-force resistance for computer algorithms and high mnemonic recall for human brains.
The mathematical security of a passphrase is based on the size of the wordlist and the number of words selected. This generator utilizes the EFF (Electronic Frontier Foundation) Large Wordlist, which contains exactly 7,777 unique, carefully curated English words. The words are selected to be easily readable, phonetically distinct, and free from common spelling ambiguities. Because each word is drawn uniformly at random from a pool of 7,777 options, each word contributes exactly $log_2 7777 approx 12.92$ bits of entropy. A four-word passphrase yields $approx 51.7$ bits of entropy, which is secure for everyday accounts. A six-word passphrase yields $approx 77.5$ bits of entropy, which is exceptionally secure and represents a search space that is practically unfeasible to attack.
Beyond raw entropy, passphrases significantly reduce transcription errors and cognitive load. If a user is forced to memorise "J9#q$2@z!", they will likely write it down on a sticky note, creating a severe physical security vulnerability. Conversely, a passphrase like "correct-horse-battery-staple" is simple to type, read aloud to a support technician if necessary, or transcribe onto a mobile phone keyboard. To improve accessibility, this generator allows users to customize the formatting, supporting lowercase, uppercase, Title Case, and camelCase casing models, along with configurable separators (hyphens, underscores, spaces, or empty joints) and optional trailing digits.
The backend processor leverages secure cryptographic randomness to query the EFF large wordlist. When a user requests a passphrase, the Go backend selects the specified number of random indices, applies the chosen casing rules, joins them with the requested separator, and computes the exact diceware entropy score. The frontend component renders this output in a large visual field with a clipboard copy utility and an elegant gauge displaying strength metrics. This gives engineers, system administrators, and security teams a robust tool to create enterprise recovery keys, master credentials, and secure, memorable passwords.