Password Generator
Create strong, random passwords with entropy scoring and crack time estimates. Random character mode or memorable passphrases. Bulk generation for multiple accounts.
Password Strength Reference
| Strength | Entropy (bits) | Example | Crack Time |
|---|---|---|---|
| Very Weak | 0 - 27 | abc123 | Seconds |
| Weak | 28 - 35 | P@ss1234 | Minutes to hours |
| Fair | 36 - 59 | Kx9$mP2w | Days to months |
| Strong | 60 - 79 | aK9$mP2w!xQ4 | Centuries |
| Very Strong | 80 - 99 | bR7&mZ2p!xQ4kF9$ | Millions of years |
| Extreme | 100+ | cT8@nW3q&yR5jG1%mX6! | Billions of years |
How to Use This Generator
Choose your mode
Random Password creates a string of mixed characters. Passphrase creates a memorable sequence of words separated by a character you choose.
Adjust the settings
Set the length, pick which character types to include, and optionally exclude ambiguous characters that look alike in some fonts.
Check the strength meter
The entropy bar shows how strong your password is. Aim for at least 60 bits (Strong) for regular accounts and 80+ bits for sensitive ones.
Copy or bulk generate
Copy your password with one click, or use Bulk mode to generate multiple passwords at once for setting up several accounts.
Password Security Best Practices
Use unique passwords
Never reuse a password across different accounts. If one service leaks, all your accounts become vulnerable.
Use a password manager
Tools like Bitwarden, 1Password, or KeePass store all your passwords securely behind one master password.
Enable two-factor auth
Even a strong password can be phished. 2FA adds a second layer that requires physical access to your device.
Rotate compromised passwords
If a service you use reports a data breach, change that password immediately. Check haveibeenpwned.com regularly.
Avoid personal info
Never use names, birthdays, pet names, or anything guessable in your passwords. Attackers try these first.
Watch for phishing
The strongest password is useless if you type it into a fake login page. Always verify the URL before entering credentials.
Why You Need a Random Password Generator
Most people pick passwords they can remember, and that is exactly the problem. Humans are terrible at being random. We gravitate toward patterns, dictionary words, personal dates, and keyboard sequences like "qwerty123" or "password1!" that feel complex but are trivially easy for automated cracking tools to guess.
How Password Cracking Actually Works
Modern password cracking does not try every possible combination one by one. Attackers use dictionaries of billions of leaked passwords, apply common substitution rules (@ for a, 3 for e, ! at the end), and leverage GPU clusters that can test tens of billions of hashes per second. A password like "Summer2024!" feels strong to a human but falls in seconds against a dictionary attack because it follows an extremely predictable pattern: capital word + year + symbol.
Random vs. Memorable: The Entropy Tradeoff
A truly random 16-character password using all character types has about 105 bits of entropy. That means there are more possible combinations than there are atoms in the solar system. No computer will crack it in your lifetime. The downside is that random passwords like "kX9$mP2w!xQ4bR7&" are impossible to memorize, which is why password managers exist.
Passphrases offer a middle ground. Four random words separated by dashes give you roughly 56 bits of entropy, which is strong enough for most accounts and easy enough to remember without a manager. For your password manager's master password or your email (the keys to everything else), go with a 6-word passphrase or a 20+ character random password.
The One Rule That Matters Most
Use a different password for every single account. Period. It does not matter how strong your password is if you use the same one on five different sites. When one of those sites gets breached (and statistically, several will), attackers take the leaked email and password combination and try it everywhere else. This attack is called credential stuffing and it accounts for a massive percentage of account takeovers.
A password manager eliminates the burden of remembering dozens of unique passwords. You remember one strong master password, and the manager handles everything else. Most modern browsers have built-in password managers, and dedicated tools like Bitwarden (free and open source), 1Password, or KeePass offer additional features like breach monitoring and secure sharing.
About This Generator
This tool uses the Web Crypto API (crypto.getRandomValues) to generate cryptographically secure random numbers directly in your browser. No passwords are transmitted to any server, stored in cookies, or logged in analytics. You can disconnect from the internet and the generator will continue to work because all computation happens client-side. The entropy calculation assumes an attacker knows your password length and character set, which is the standard worst-case security model.