Secure Password Generator
Generate unhackable passwords locally in your browser.
Zero server transmission. 100% Private.
window.crypto. They are not sent to any server or stored anywhere.Technical Deep Dive: How We Guarantee Randomness
Most online password generators use JavaScript's built-in Math.random() function. This is **not secure** because it is a "pseudo-random" number generator, meaning the numbers it produces are predictable if you know the seed state.
UtilBelt exclusively uses the **Web Crypto API** (window.crypto.getRandomValues). This taps into your operating system's entropy pool (mouse movements, keystrokes, thermal noise) to generate *truly* unpredictable numbers. Because this happens in your browser, the private key never touches our network.
Understanding Entropy
Entropy is the mathematical measure of randomness. A password like password123 has extremely low entropy (~20 bits) and can be cracked in milliseconds. A generated password like X7f#9L$m2@k has high entropy (~70+ bits).
- Low (Under 40 bits): Likely to be cracked instantly.
- Medium (40-60 bits): Susceptible to GPU cluster attacks.
- High (60+ bits): Computationally infeasible to crack.
Enterprise Security Tips
- Salt Your Passwords: If you are a developer, never store plain text. Use bcrypt or Argon2 to hash them.
- Rotation Policy: NIST guidelines now recommend *against* frequent mandatory rotation, as it encourages weaker passwords. Focus on length and uniqueness.
- 2FA is Mandatory: Even the strongest password cannot protect against phishing. Always enable Two-Factor Authentication.
Enhance Your Security Toolkit
Frequently Asked Questions
Is it safe to generate passwords here?
Yes. This tool runs 100% in your browser using the Web Crypto API. Your passwords never leave your device and are never sent to our servers.
How does the randomness work?
We use window.crypto.getRandomValues() which provides cryptographically secure random numbers generated by your operating system, ensuring high entropy and unpredictability.
Why are some characters excluded?
By default, we include all characters. You can choose to exclude 'similar' characters (like 1, l, I) or 'ambiguous' symbols to make passwords easier to read and type manually.