Build memorable, high-entropy passphrases from random words. Fully client-side — nothing leaves your browser.
Your Passphrase
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A passphrase is a sequence of random words used as a password — easier to remember than a string of random characters, yet statistically stronger. The classic example is "correct-horse-battery-staple" from the XKCD comic by Randall Munroe.
Entropy measures unpredictability in bits. Each additional word multiplies the search space exponentially: a 4-word phrase from a 170-word list gives around 28 bits per word, totalling ~112 bits — far beyond what brute-force attacks can reach. Adding capitalisation, numbers, and symbols pushes entropy even higher.
The estimated crack time assumes an attacker running one trillion (10¹²) password guesses per second — roughly the upper end of modern GPU cluster speeds. In practice most attacks are far slower.
All generation happens entirely in your browser using the Web Crypto API's Math.random() fallback. No passphrase is ever transmitted to any server.
Yes, Passphrase Generator is completely free to use on UtilityCove.
No. Passphrase Generator runs in your browser, so your input stays on your device.
Yes. Passphrase Generator works on modern mobile and desktop browsers.
Password Strength Checker
Score your password strength and generate stronger ones.
Password Generator
Generate strong random passwords with configurable length and character sets.
Decision Maker
Let the tool randomly pick from your list of options.
Yes or No Wheel
Spin a wheel for a random yes or no answer.
My Screen Size
Detect your current screen resolution and aspect ratio.
Screen Sizes Reference
Common Apple device screen sizes and resolutions.