How to Generate Strong Passwords: A Complete Guide
Learn why strong passwords matter, what makes a password secure, and how to generate unbreakable passwords using cryptographically secure methods.
In 2024, weak passwords remain one of the top causes of data breaches. Despite years of advice, "123456" and "password" still top the list of most commonly used passwords. Let's fix that.
What Makes a Password Strong?
Password strength is measured in entropy — the amount of randomness in the password. Higher entropy means more possible combinations and a harder password to crack.
- Length — Each additional character exponentially increases the number of possible combinations. A 16-character password is billions of times stronger than an 8-character one.
- Character variety — Using uppercase, lowercase, numbers, and symbols increases the character set from 26 to 95+ characters.
- Randomness — Patterns, dictionary words, and personal info are easily guessable. True randomness is essential.
How Many Bits of Entropy Do You Need?
Each bit of entropy doubles the number of possible passwords:
- 40 bits — Minimum acceptable (can be cracked in hours)
- 60 bits — Good for most accounts
- 80 bits — Excellent security
- 128+ bits — Military-grade, essentially uncrackable with current technology
Math.random() vs. crypto.getRandomValues()
Not all random number generators are created equal:
Math.random()uses a pseudo-random algorithm (PRNG) that can be predicted if the seed is known. Never use this for security.crypto.getRandomValues()uses a cryptographically secure PRNG (CSPRNG) seeded by the operating system's entropy pool. This is what our tool uses.
Password Best Practices
- Use a unique password for every account — If one site is breached, your other accounts remain safe.
- Use a password manager — You only need to remember one master password.
- Enable two-factor authentication (2FA) — Even the strongest password can be phished.
- Minimum 14 characters — Longer is always better.
- Avoid personal information — Names, birthdays, and pet names are easily guessed.
Generate a Password Now
Use our Password Generator to create a cryptographically secure password with customizable length and character sets — all processed locally in your browser.