Create strong, random passwords with custom length and character types. Everything stays in your browser.
This password generator uses the Web Crypto API's crypto.getRandomValues() function, which is a cryptographically secure random number generator (CSPRNG). Unlike Math.random(), this API uses entropy from your operating system to produce numbers that are practically impossible to predict.
When you click Generate, the tool builds a character pool from your selected options (uppercase, lowercase, numbers, symbols). It then generates random indices into that pool for each character position. The result is a truly random string that has no pattern or meaning.
The strength meter evaluates your password by checking length thresholds (8, 12, 16, 24 characters) and character variety. A password with 16+ characters using all four types scores "Excellent" and would take billions of years to crack with current computing power.
| Password Length | Lowercase Only | + Uppercase | + Numbers | + Symbols (All Types) |
|---|---|---|---|---|
| 6 characters | Seconds | Minutes | Minutes | Hours |
| 8 characters | Hours | Days | Weeks | Months |
| 10 characters | Weeks | Months | Years | Decades |
| 12 characters | Years | Decades | Centuries | Millennia |
| 16 characters | Centuries | Millennia | Millions of years | Billions of years |
| 20 characters | Millions of years | Billions of years | Trillions of years | Trillions of years |
| 24+ characters | Billions of years | Trillions of years | Virtually uncrackable | Virtually uncrackable |
Estimates assume 10 billion guesses/second (modern GPU cluster). Actual times vary by algorithm and attacker resources.
| Character Set | Characters | Pool Size | Example |
|---|---|---|---|
| Lowercase only | a–z | 26 | abcdefghijkmnopqrstuvwxyz |
| + Uppercase | a–z, A–Z | 52 | abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ |
| + Numbers | a–z, A–Z, 0–9 | 62 | abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 |
| + Symbols | All printable | 95 | abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()_+-=[]{}|;:,.<>? |
More characters in the pool = exponentially harder to crack. A 12-char password with 95 symbols has 9512 = 540 quadrillion combinations.
| Weak Pattern | Why It’s Bad | Strong Alternative |
|---|---|---|
| Password123 | Top of every cracking dictionary | kP7$mN2vXq9!wR4 |
| Using personal info (birthdate, pet name) | Easily guessed from social media | Randomly generated by this tool |
| Reusing the same password everywhere | One breach compromises all accounts | Unique password per site + password manager |
| Short passwords (< 8 chars) | Cracked in seconds to minutes | Minimum 12–16 characters |
| Common substitutions (p@ssw0rd) | Cracking tools know all letter-number swaps | Truly random character sequences |
| Keyboard patterns (qwerty, 123456) | First attempts in any brute-force attack | No recognizable patterns |
| Single dictionary word | Dictionary attacks try all common words | Random chars or 4+ random words (passphrase) |
| Writing passwords on sticky notes | Physical security risk | Encrypted password manager (Bitwarden, 1Password) |
A strong password should be at least 12-16 characters long and include a mix of uppercase letters, lowercase letters, numbers, and symbols. NIST recommends using long passphrases of 15+ characters. This generator defaults to 16 characters with all character types enabled.
Yes. This tool uses the browser's crypto.getRandomValues() API, which is a cryptographically secure random number generator. Passwords are generated entirely in your browser and are never sent to or stored on any server.
The strength meter scores your password based on length (8+, 12+, 16+, 24+ characters) and character variety (uppercase, lowercase, numbers, symbols). More length and variety means a higher score from "Very Weak" to "Excellent".
No. You should use a unique password for every account. If one account is compromised, unique passwords prevent attackers from accessing your other accounts. Consider using a password manager to store all your generated passwords securely.
Length is the most important factor. A 16-character password with mixed characters would take centuries to brute-force. Avoid dictionary words, personal information, and common patterns like "Password123". Random passwords generated by this tool are ideal.
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