Why You Need a Strong Password
Weak passwords are the number one cause of account breaches. A password like password123 can be cracked in under a second by modern hardware. A randomly generated 16-character password with mixed character types, on the other hand, would take millions of years to brute-force — even with a GPU cluster running billions of guesses per second.
The difference between a weak and strong password is not about memorability — it is about randomness. Human-chosen passwords follow predictable patterns (birthdays, pet names, keyboard walks like qwerty). A cryptographic random generator has no patterns, making it exponentially harder to attack.
How Our Password Generator Works
This tool uses the Web Crypto API — specifically crypto.getRandomValues() — which is built into every modern browser and uses the operating system's cryptographically secure random number generator (CSPRNG). This is the same level of randomness used in TLS certificates and cryptographic keys.
All generation happens locally in your browser tab. No network request is made. Your passwords never touch our servers — in fact, we don't even have a server component involved in password generation.
Password vs Passphrase: Which is More Secure?
Both can be equally secure when generated randomly. A random password like X#k9mR!qLv2@ packs maximum entropy into a short string but is hard to remember. A passphrase like correct-horse-battery-staple is easier to type and remember while still being extremely strong.
For accounts you need to type regularly (OS login, password manager master password), a 4-6 word passphrase is often the better choice. For everything else stored in a password manager, use a 16-20 character random password.
How Long Should Your Password Be?
Password strength is primarily a function of length and character set size. Here is a quick reference:
- 8 characters — Minimum acceptable. Not recommended for sensitive accounts.
- 12 characters — Good for most accounts.
- 16 characters — Excellent. Effectively uncrackable with full character set.
- 20+ characters — Maximum security for banking, email, and password managers.
Frequently Asked Questions
Is this password generator safe to use?
Yes. All passwords are generated entirely in your browser using the Web Crypto API (crypto.getRandomValues). No data is ever transmitted to any server.
How long should my password be?
For most accounts, 16 characters is excellent. For highly sensitive accounts (banking, email), use 20+ characters. Longer is always better.
What is a passphrase and is it better than a password?
A passphrase is a sequence of random words (e.g., correct-horse-battery-staple). They are easier to remember than random characters and can be just as secure. A 4-word passphrase from a 300-word list has approximately 33 bits of entropy.
Should I use symbols in my password?
Symbols increase entropy significantly. A 12-character password with only lowercase has 56 bits of entropy. Adding symbols increases the character pool to 95, raising entropy to 78 bits for the same length.
What does "entropy" mean in password security?
Entropy measures the unpredictability of a password in bits. Higher entropy means more possible combinations and a harder brute-force attack. 60+ bits is considered strong for most use cases.