Random Password Generator
Using a weak or reused password is one of the most common ways accounts get hacked. This tool generates a strong, completely random password using your browser's built-in secure random number generator. You can choose how long the password should be and which types of characters to include. Generate as many passwords as you need. Nothing is stored or sent anywhere. For best security, use a password manager to save the passwords this tool creates for you.
Frequently Asked Questions
How long should a strong password be?
Security experts recommend at least 12 characters for most accounts, and 16 or more for email and banking. Longer passwords are exponentially harder to crack. A 16-character random password is considered very strong by today's standards.
Is it safe to generate passwords in a browser tool?
Yes, if the tool uses your browser's built-in random number generator and does not send anything to a server. This tool uses the Web Crypto API (crypto.getRandomValues), the same source browsers use for security functions. Nothing is transmitted.
Should I use a different password for every website?
Yes. Reusing passwords is one of the biggest security risks. If one site is breached and your password is exposed, attackers will try it on every other site. Use a password manager to store a unique strong password for each account.
What makes a password hard to crack?
Length and randomness matter most. A long random password using all character types has so many possible combinations that brute-force attacks become impractical. Avoid dictionary words, names, birthdates, and predictable patterns like "Password1!".
How is this password generator different from using Math.random()?
This tool uses crypto.getRandomValues(), which draws from the browser's cryptographically secure random number generator (CSPRNG). Math.random() is a pseudo-random number generator (PRNG) — its output is predictable if an attacker knows the seed. CSPRNGs are designed to be unpredictable and are the correct choice for any security-sensitive operation like password generation.
What is a passphrase and is it better than a random password?
A passphrase is 4-6 random words strung together, like "correct-horse-battery-staple". It is typically longer than a random password (20-30 characters), making it statistically stronger even though it uses only letters. Passphrases are also much easier to remember and type. For accounts you type manually (like your laptop password), a passphrase is often the better choice.
How often should I change my passwords?
The old advice to change passwords every 90 days is now considered counterproductive — users who must change frequently tend to create weaker, predictable passwords. The current recommendation from NIST is to change a password only when there is evidence it has been compromised. Check if your email has appeared in a known breach at HaveIBeenPwned.com, and change any exposed passwords immediately.
How It Works
This tool uses crypto.getRandomValues() to draw cryptographically secure random bytes. Each byte is mapped to a character from the allowed pool (uppercase, lowercase, digits, symbols) using a modulo operation. Unlike Math.random(), the browser's CSPRNG is seeded from hardware entropy and produces unpredictable output suitable for security-sensitive applications.
Password Entropy
Entropy (in bits) = log2(pool_size) x length. A 16-character password using all 94 printable ASCII characters has log2(94) x 16 ≈ 104 bits of entropy. At 1 trillion guesses per second, cracking a 104-bit password would take longer than the age of the universe. Adding even 2 characters is more effective than any symbol requirement.
Password Manager Tip
The main reason people reuse weak passwords is that strong unique passwords are hard to remember. The solution is a password manager (Bitwarden, 1Password, KeePass). Let the manager generate and store a unique 20+ character password for every site. You only need to remember one strong master password — your password manager handles the rest.
When to Use This
Use to generate a strong password for a new account, to replace a weak or reused password you identified during a security review, to create a temporary password to share with a colleague (then change it once they log in), or to generate a random string for use as an API key, secret token, or encryption passphrase.
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