How to Generate Secure Passwords
Weak passwords are one of the leading causes of account breaches. Using a random password generator ensures that your passwords are unpredictable and resistant to brute-force attacks. This tool creates cryptographically secure passwords using your browser's built-in random number generator.
How to Use This Generator
- Set your desired password length using the slider. The minimum is 8 characters and the maximum is 64. Longer passwords are more secure.
- Choose character types by toggling uppercase letters, lowercase letters, numbers, and symbols on or off. Using all four types creates the strongest passwords.
- Click Generate Password to create a new random password. The result and strength indicator update immediately.
- Click Copy to copy the password to your clipboard, or click Generate 5 to create five passwords at once for setting up multiple accounts.
How It Works
The generator builds a character pool based on your selected options (uppercase, lowercase, numbers, symbols), then uses the Web Crypto API (crypto.getRandomValues) to select random characters from the pool. This method provides cryptographically secure randomness, meaning the output is unpredictable even to an attacker who knows the algorithm. The strength indicator evaluates the password based on length and the number of character types used, rating it from Weak to Very Strong. All generation happens locally in your browser — no password is ever transmitted over the network.
Frequently Asked Questions
How long should my password be?
Security experts recommend a minimum of 12 characters, but 16 or more is ideal. Each additional character exponentially increases the number of possible combinations, making brute-force attacks far more difficult. Our generator supports lengths up to 64 characters.
What makes a password strong?
A strong password combines uppercase letters, lowercase letters, numbers, and symbols, and is at least 12 characters long. It should not contain dictionary words, personal information, or common patterns like 123456 or password.
Is this password generator secure?
Yes. All passwords are generated entirely in your browser using the Web Crypto API (crypto.getRandomValues), which provides cryptographically secure random numbers. No passwords are ever sent to or stored on any server.
Should I use different passwords for every account?
Absolutely. Reusing passwords means that if one account is breached, all accounts with the same password are vulnerable. Use a unique password for every account and store them in a reputable password manager.
What is a password strength indicator?
The strength indicator rates your password based on length and character variety. Weak passwords are short with few character types. Strong passwords use all four character types (uppercase, lowercase, numbers, symbols) and are at least 16 characters long.
Can I generate multiple passwords at once?
Yes. Click the Generate 5 Passwords button to create five unique passwords with the same settings. Each password is independently generated using cryptographically secure randomness.
How long should a password be?
At minimum, your password should be 12 characters long, though 16 or more characters is ideal for important accounts. Each additional character exponentially increases the time required for an attacker to crack your password through brute force. A 16-character truly random password using all character types would take millions of years to crack with current computing technology.
Should I use the same password for multiple sites?
Never reuse the same password across multiple websites or services. If one site suffers a data breach, attackers will automatically try your leaked credentials on every major service including email, banking, and social media. Use a unique, randomly generated password for every single account you create.
What is a password manager?
A password manager is software that stores all your passwords in a single encrypted vault, protected by one strong master password that you memorise. It automatically fills in login forms and can generate strong, unique passwords for each new account. Popular options include Bitwarden (free and open source), 1Password (paid, excellent for teams), and Apple Keychain (free, built into Apple devices).
What are the most common passwords?
"123456", "password", "qwerty", and "abc123" consistently appear at the top of leaked password lists year after year. These passwords are cracked instantly by any automated hacking tool, offering virtually no security at all. If your password appears on any common password list, change it immediately to a long, randomly generated alternative.
What is two-factor authentication?
Two-factor authentication (2FA) is an extra security layer that requires something you know (your password) plus something you have (usually your phone) to log in. Even if your password is stolen in a data breach or phishing attack, attackers cannot access your account without the second factor. Use an authenticator app like Google Authenticator or Authy rather than SMS codes, which can be intercepted.
How often should I change my password?
Modern security guidance from organisations like NIST says you should only change passwords when there is evidence of a breach or compromise. Frequent forced password changes actually lead to weaker passwords because users resort to predictable patterns and minor variations. Focus on making each password unique, long, and truly random rather than changing passwords on a fixed schedule.
What should I do if my password is leaked?
Change the compromised password immediately on the affected site and on any other site where you used the same password. Check haveibeenpwned.com to see if your email address appears in known data breaches and take action on every affected account. Enable two-factor authentication on all important accounts to add an extra layer of protection against future breaches.
What Makes a Strong Password?
Length is the single most important factor in password strength. A 16-character password is exponentially harder to crack than an 8-character one, even if the shorter password includes special characters. The ideal password combines uppercase letters, lowercase letters, numbers, and symbols in a random sequence that does not form recognisable words or patterns. Avoid dictionary words, names, dates of birth, and keyboard patterns like "qwerty" or "123456". Never reuse passwords across multiple accounts — if one service suffers a data breach, attackers will automatically try your leaked credentials on banking, email, and social media sites.
How Are Passwords Attacked?
Understanding how attackers crack passwords helps you appreciate why randomness matters. Brute force attacks try every possible combination of characters, starting with short passwords and working upward. An 8-character lowercase-only password has 209 billion combinations — sounds like a lot, but modern hardware can test billions per second. Dictionary attacks use lists of common words, names, and known passwords, along with common substitutions (@ for a, 3 for e). Credential stuffing uses username-password pairs leaked from other breaches. Phishing tricks you into entering your password on a fake website. Keyloggers are malware that silently records every keystroke on an infected device.
How Long Would It Take to Crack Your Password?
The time to crack a password depends on its length, character variety, and the attacker's hardware. An 8-character password using only lowercase letters can be cracked in under a second. Add uppercase, numbers, and symbols and it takes a few hours. A 12-character mixed password takes years. A 16-character truly random password with all character types would take millions of years with current technology. This is why our generator defaults to longer passwords — the computational difficulty scales exponentially with each additional character.
Password Managers
Trying to remember dozens of unique, complex passwords is impractical. This is exactly the problem password managers solve. They store all your credentials in a single encrypted vault, protected by one strong master password that you do need to memorise. When you visit a website, the manager auto-fills your login details. Recommended options include Bitwarden (free, open source, and highly regarded by security experts), 1Password (paid, excellent for families and teams), Apple Keychain (free, built into all Apple devices), and Google Password Manager (free, built into Chrome). Avoid writing passwords on sticky notes or storing them in unencrypted text files.
Two-Factor Authentication
Even the strongest password can be compromised in a data breach or phishing attack. Two-factor authentication (2FA) adds a second layer of security by requiring something you have (usually your phone) in addition to something you know (your password). When you log in, the service sends a one-time code to your authenticator app or phone. Without this code, an attacker who has your password still cannot access your account. Use an authenticator app like Google Authenticator or Authy rather than SMS codes, which can be intercepted through SIM-swapping attacks. Enable 2FA on every account that supports it, starting with email, banking, and social media.