Free Password Generator – Create Secure Passwords Online
Generate cryptographically secure passwords instantly. Customize length (4-64 characters), character types, and strength. Web Crypto API security. See crack time estimates. 100% free, browser-based.
What Is This Tool?
This password generator creates truly random passwords using the Web Crypto API—the same cryptographic system used by your browser for HTTPS connections. Your passwords are never stored or transmitted.
Why Use a Password Generator?
Human-generated passwords are predictable: Studies show people use patterns like "Password123" or pet names with birthdays. Hackers know these patterns.
Random passwords resist attacks: A truly random 16-character password takes centuries to crack with current technology.
Unique passwords prevent breaches: When one site is hacked, unique passwords protect your other accounts.
How to Use This Generator
Step 1: Choose a Preset or Customize
- Simple (8): Quick accounts, low-security needs
- Standard (12): Most online accounts
- Strong (16): Banking, email, important accounts
- Maximum (24): Maximum security paranoia
Step 2: Customize Options
Toggle character types:
- Uppercase (A-Z)
- Lowercase (a-z)
- Numbers (0-9)
- Symbols (!@#$%)
Step 3: Generate & Copy
Click Generate, then copy to your password manager.
Understanding Password Strength
Crack Time Estimates
| Strength | Crack Time | Example |
|---|---|---|
| Weak | Instant - Seconds | abc123 |
| Fair | Minutes - Hours | Hello2024! |
| Strong | Years | Kx9!mP2#vQ4 |
| Very Strong | Centuries - Never | 7Hs$pL9@mNq2#xWv |
What Makes Passwords Strong?
- Length: Most important factor. Each character exponentially increases security.
- Randomness: No dictionary words, patterns, or sequences.
- Character variety: Mix of uppercase, lowercase, numbers, symbols.
- Uniqueness: Never reused across accounts.
Password Length Recommendations
| Use Case | Minimum | Recommended |
|---|---|---|
| Throwaway accounts | 8 | 12 |
| Social media | 12 | 16 |
| 14 | 18 | |
| Banking | 16 | 20+ |
| Password manager | 20 | 24+ |
| Encryption keys | 24 | 32+ |
Security Best Practices
DO:
✅ Use a password manager (1Password, Bitwarden, LastPass) ✅ Enable two-factor authentication (2FA) ✅ Use unique passwords for every account ✅ Generate passwords at least 16 characters ✅ Include all character types when possible
DON'T:
❌ Reuse passwords across sites ❌ Use personal information (birthdays, names) ❌ Share passwords via email or text ❌ Store passwords in plain text files ❌ Use keyboard patterns (qwerty, 12345)
Common Password Attacks
Brute Force
Tries every possible combination. Defeated by length and complexity.
Dictionary Attack
Tries common words and variations. Defeated by randomness.
Credential Stuffing
Uses leaked passwords from other breaches. Defeated by unique passwords.
Phishing
Tricks you into entering passwords on fake sites. Defeated by 2FA and vigilance.
Technical Details
Web Crypto API
This generator uses crypto.getRandomValues(), which provides cryptographically secure random values. It's the same standard used for:
- HTTPS/TLS encryption
- Secure key generation
- Cryptographic signatures
Entropy Calculation
Password entropy = log₂(charset^length)
Example (16-char with all types):
- Charset: 26 + 26 + 10 + 32 = 94 characters
- Entropy: log₂(94^16) ≈ 105 bits
- Crack time at 1 trillion guesses/second: ~1,000,000 years
Frequently Asked Questions
Are these passwords truly random?
Yes. We use the Web Crypto API which provides cryptographically secure randomness, not Math.random().
Is my password saved anywhere?
No. Generation happens entirely in your browser. Nothing is sent to any server.
What's the best password length?
16 characters minimum for important accounts. 20+ for maximum security.
Should I exclude similar characters?
Yes, if you might need to type the password manually. No, if using a password manager.
Can I use special characters?
Yes, symbols significantly increase password strength. Only exclude them if a site doesn't allow them.