Password Generator

Create secure, random passwords with customizable options.

UppercaseLowercaseNumbersSymbols

Length: 12

About This Tool

Generate secure, random passwords with customizable complexity options.

🔑 How to Use

Adjust password length using the slider
Select character types to include
Click "Generate Password"
Copy your password with the "Copy" button

💡 Pro Tips

✔ Go Long – Use 16+ characters. Length matters far more than symbols for real-world security.
✔ One Password per Site – Never reuse passwords. One breach can compromise every account that shares it.
✔ Copy with One Click – Use the 📋 Copy button to grab the generated password instantly.
✔ Works Offline – Once the page loads, the generator runs entirely in your browser — no internet needed.
✔ Use a Password Manager – Store generated passwords in Bitwarden, 1Password, or KeePass instead of writing them down.
✔ Enable 2FA – Add two-factor authentication wherever possible. It stops most attacks even if your password leaks.

Password Security: What Actually Matters

Password security is often misunderstood. Most advice you see online focuses on making passwords look complicated — uppercase letters, symbols, numbers — but the reality is simpler and more interesting. What actually protects your accounts is randomness, length, and uniqueness. Everything else is mostly noise.

When you generate a password on NinjaFunction, it's created using your browser's built-in cryptographically secure random number generator (crypto.getRandomValues). That matters — many "password generators" on the web use Math.random(), which is predictable and unsuitable for security. Ours never leaves your device: the password is generated locally in your browser, never transmitted to us or anyone else.

How Passwords Get Cracked

Attackers don't sit at a keyboard guessing passwords one by one. They use automated tools running on GPUs that can try billions of combinations per second. There are three main techniques:

Brute force. Trying every possible combination until one works. A modern GPU can test over 100 billion MD5 hashes per second. This is why short passwords fail — an 8-character password can be cracked in minutes, while a 16-character one would take longer than the age of the universe.
Dictionary attacks. Trying common words, names, and known leaked passwords first. "Password123" and "Qwerty2024" fall in seconds. Even adding symbols doesn't help much if the base word is a dictionary word.
Credential stuffing. Using passwords leaked from one site to log into every other site you use. If you reuse a password, one breach becomes dozens of breaches overnight.

What Makes a Password Strong?

Strength comes down to entropy — a measure of how unpredictable a password is. A random 12-character password using lowercase + uppercase + digits + symbols has about 78 bits of entropy. A random 16-character one has about 104 bits. For context, 80 bits is generally considered uncrackable with current technology.

This is why our generator uses a cryptographically secure random source and lets you pick the length. The more characters you allow, the exponentially harder the password becomes to guess. Every extra character roughly multiplies the search space by the size of your character set.

Common Password Mistakes to Avoid

Using the same password everywhere. The single biggest security mistake. One leak compromises your entire digital life.
Writing passwords in plain text. Sticky notes on your monitor, plain text files, or unencrypted spreadsheets are all vulnerable. Use a password manager instead.
Sharing passwords over email or chat. Email is not encrypted end-to-end. If you must share, use a tool like Bitwarden Send or an ephemeral secret-sharing service.
Using predictable patterns. "Summer2024!" and "CompanyName@123" are extremely common — attackers try these first.
Answering security questions honestly. Your mother's maiden name is public record in many countries. Use random answers and store them in your password manager.

Password Security: What Actually Matters

How Passwords Get Cracked

Attackers don't sit at a keyboard guessing passwords one by one. They use automated tools running on GPUs that can try billions of combinations per second. There are three main techniques:

Brute force. Trying every possible combination until one works. A modern GPU can test over 100 billion MD5 hashes per second. This is why short passwords fail — an 8-character password can be cracked in minutes, while a 16-character one would take longer than the age of the universe.

Dictionary attacks. Trying common words, names, and known leaked passwords first. "Password123" and "Qwerty2024" fall in seconds. Even adding symbols doesn't help much if the base word is a dictionary word.

Credential stuffing. Using passwords leaked from one site to log into every other site you use. If you reuse a password, one breach becomes dozens of breaches overnight.

What Makes a Password Strong?

Common Password Mistakes to Avoid

Using the same password everywhere. The single biggest security mistake. One leak compromises your entire digital life.

Writing passwords in plain text. Sticky notes on your monitor, plain text files, or unencrypted spreadsheets are all vulnerable. Use a password manager instead.

Sharing passwords over email or chat. Email is not encrypted end-to-end. If you must share, use a tool like Bitwarden Send or an ephemeral secret-sharing service.

Using predictable patterns. "Summer2024!" and "CompanyName@123" are extremely common — attackers try these first.

Answering security questions honestly. Your mother's maiden name is public record in many countries. Use random answers and store them in your password manager.