Password Generator: How to Create Strong Passwords That Are Actually Secure

Most passwords people choose themselves are weak - not because of laziness, but because of how human memory works. We gravitate toward meaningful words, predictable substitutions (3 for e, @ for a), and familiar patterns. Attackers know this and exploit it. A proper password generator removes human bias entirely, producing strings that are genuinely random and therefore genuinely difficult to crack. This guide explains what makes a password strong, how generators work under the hood, and how to build a password strategy that holds up in practice.

Password strength is measured in entropy - the number of possible combinations an attacker would need to try. Entropy is determined by two things: the size of the character set and the length of the password. A six-character password using only lowercase letters has 26^6 = 308 million possible combinations. Sounds large until you learn that modern GPUs can try ten billion combinations per second. That same password is cracked in milliseconds. Increase the length to 16 characters and add uppercase, digits, and symbols (a character set of around 95 characters) and the combinations rise to 95^16 - a number with 31 digits. At ten billion guesses per second, cracking takes longer than the age of the universe.

This is the most important thing to understand about password security. 'P@ssw0rd1' is terrible not because it lacks symbols, but because it follows a pattern attackers model. A passphrase like 'correct-horse-battery-staple' (no special characters) has higher entropy because it is longer and the word combination is not predictable. NIST's 2024 Digital Identity Guidelines now explicitly recommend long passphrases over short complex passwords, and they advise against mandatory character-type requirements that push users toward predictable substitutions.

• Minimum 16 characters for standard accounts - longer for anything critical
• Include all character types (uppercase, lowercase, digits, symbols) when the site allows it
• Never reuse passwords - a breach of one site should never compromise another
• Avoid personal information - names, birthdays, and phone numbers are in attacker dictionaries
• Avoid keyboard patterns - qwerty, 12345, asdfgh are among the first tried
• Avoid common substitutions - 3 for e, @ for a, 0 for o are standard in cracking dictionaries

A proper password generator uses a cryptographically secure pseudorandom number generator (CSPRNG), not a standard math.random() call. In browsers, this is the Web Crypto API's `crypto.getRandomValues()`. The generator takes a character set (e.g. all 95 printable ASCII characters), picks characters from it at random using CSPRNG, and concatenates them to the desired length. The crucial property is uniform distribution - every character in the set has an equal probability of being selected, with no patterns or biases. Searchlight's password generator uses `crypto.getRandomValues()` and runs entirely in your browser, meaning your generated passwords are never transmitted anywhere.

A passphrase strings together four or more random dictionary words: something like 'maple-invoice-spark-77-orbit'. These are easier to remember than random character strings and often longer (30+ characters), giving them high entropy. The trade-off is that dictionaries used in cracking attempts now include common word combinations, so the randomness of the word selection matters as much as the length. A passphrase generator that picks truly random words from a large wordlist (10,000+ words) is secure. One that generates 'correct horse battery staple' predictably from a list of 1,000 common words is not.

1. Open the Password Generator at seosearchlight.com/tools/password-generator
2. Set the length - 16 characters minimum, 20+ for important accounts
3. Choose which character types to include (uppercase, lowercase, digits, symbols)
4. Click Generate - a new random password appears instantly
5. Click Copy to copy to clipboard, then paste into your password manager
6. Click Generate again for a different password - each is independently random

Generating strong passwords is only half the solution. The other half is storing them. Writing passwords on paper, keeping them in a spreadsheet, or reusing one strong password across sites all introduce serious risks. A password manager (Bitwarden, 1Password, Dashlane, or the one built into your browser) stores an unlimited number of unique, strong passwords encrypted behind a single master password. The master password is the only one you need to remember. Combined with a random password generator, you end up with every account protected by a unique 20-character random string - cracking any one of them would take longer than the heat death of the universe.

Even a perfect password can be compromised in a phishing attack where you type it into a fake login page. Two-factor authentication (2FA) means an attacker who has your password still cannot log in without access to your second factor. Use an authenticator app (Google Authenticator, Authy, or the built-in options in iOS and Android) rather than SMS codes wherever possible - SMS can be intercepted via SIM-swapping attacks. Hardware keys (YubiKey) offer even stronger protection for high-value accounts.