What is a password generator?
A password generator creates a random, unpredictable string of characters designed to be as difficult as possible to crack. Unlike a password you come up with yourself, a generated password has no pattern, no dictionary words, and no personal information — which are the three things attackers look for first.
Online accounts get compromised two main ways: data breaches (where stored passwords leak) and brute-force attacks (where software cycles through billions of guesses per second). A long, random password defeats both. A 16-character password using all four character types has roughly 95^16 possible combinations — over 440 quadrillion possibilities. At one billion guesses per second, that would take more than 13 million years to exhaust. Every character you add multiplies the difficulty exponentially, which is why length matters more than complexity alone. A 20-character lowercase-only password is stronger than an 8-character one with symbols.
This generator uses the Web Crypto API (window.crypto.getRandomValues) for cryptographic-quality randomness — the same standard used in security software. Passwords are generated entirely in your browser and are never sent to any server.
Random password vs. passphrase
This tool offers two modes. Random password creates a mix of characters like X7#mKp2@vL9q — maximum entropy, ideal for accounts you store in a password manager. Passphrase creates a sequence of random words like Rocket-Cabin-Swift-Delta — easier to type and remember, great for a master password or anything you need to enter manually on a device without autofill.
A 4-word passphrase drawn from a large word list has more entropy than most 10-character random passwords. Add a number or capitalize the words and the security is equivalent to a 14-character random password — with the added benefit that you can actually remember it.
How to use this password generator
Choose your type. Select Random Password for maximum security or Passphrase for something easier to type. Random passwords work best with a password manager; passphrases work best when you need to memorize the result.
Set your length. Use the slider to pick length. Most security experts recommend at least 12 characters for general accounts and 16 or more for email, banking, and anything tied to your finances.
Pick your character types. All four types are on by default. Check Exclude ambiguous characters if you need to read the password aloud or type it manually — it removes l, 1, I, O, and 0 to avoid confusion.
Copy your password. Click the copy button and paste it directly into the password field. Hit Generate any time to get a fresh option instantly.