Why Use a Password Generator?
Weak passwords are the number one cause of account breaches. A password generator creates truly random passwords that are virtually impossible to guess or brute-force.
Humans are bad at randomness. When people create passwords, they tend to use predictable patterns — dictionary words, birthdays, keyboard patterns like "qwerty," or simple substitutions like "p@ssw0rd." Attackers know these patterns and exploit them.
Password generators use cryptographic randomness. This tool uses your browser's Web Crypto API to generate passwords with genuine randomness, not pseudo-random guesses.
How to Use This Tool
- Adjust the length using the slider (longer is stronger).
- Toggle character types — uppercase, lowercase, numbers, and symbols.
- Check the strength meter — aim for "Strong" or "Very Strong."
- Copy your password with one click.
- Click Regenerate to create a new one.
What Makes a Strong Password?
Password strength is measured in bits of entropy — the number of possible combinations an attacker would need to try. More entropy = harder to crack.
- 40 bits — Weak. Crackable in seconds with modern hardware.
- 60 bits — Fair. Resists casual attacks but not dedicated ones.
- 80 bits — Strong. Would take years to brute-force.
- 100+ bits — Very Strong. Effectively unbreakable with current technology.
Entropy depends on two factors:
- Length — Each additional character multiplies the number of possibilities.
- Character variety — Using uppercase, lowercase, numbers, and symbols increases the pool of possible characters per position.
A 16-character password using all character types has about 105 bits of entropy — more than enough for any use case.
Password Best Practices
- Use a unique password for every account. If one service gets breached, your other accounts stay safe.
- Use a password manager. Tools like 1Password, Bitwarden, or Apple Keychain store and auto-fill your passwords so you don't have to remember them.
- Enable two-factor authentication (2FA). Even the strongest password benefits from a second layer of protection.
- Never share passwords via email, text, or chat. Use your password manager's sharing feature instead.
- Minimum 12 characters. Anything shorter is increasingly vulnerable as hardware gets faster.
How Brute-Force Attacks Work
A brute-force attack tries every possible combination until it finds your password. The time it takes depends on:
| Password Type | Example | Time to Crack |
|---|---|---|
| 6 lowercase letters | abcdef | Instant |
| 8 mixed case + numbers | Ab3dEf9h | Hours |
| 12 all character types | aB3$eF9h!kL2 | Centuries |
| 16 all character types | aB3$eF9h!kL2mN4@ | Heat death of universe |
This is why length and character variety matter so much.