Password Generator
Generate strong, secure passwords instantly in your browser.
- Zero Network LatencyGenerated 100% locally via browser
crypto.getRandomValues(). - Entropy VerifiedUp to 384 bits of cryptographic randomness from the OS kernel CSPRNG, resistant to dictionary attacks.
- Zero Cloud LoggingPure zero-persistence client sandbox. No credentials ever touch a server or backend.
Documentation
Understanding Password Entropy & Security
In contemporary cryptanalysis, password strength is governed strictly by information entropy (H = L · log₂(N)), where L is length and N is character pool size. Length scales security exponentially, whereas substituting characters (like '@' for 'a') only scales complexity linearly.
For maximum defense against GPU hash-cracking arrays (e.g. Hashcat benchmarking billions of combinations per second), standard NIST SP 800-63B guidelines recommend a minimum length of 16 characters for critical services.
Recommended Length MatrixNIST SP 800-63B
12 chars
Casual Forums
Casual Forums
16 chars
Vault Master / Banking
Vault Master / Banking
24–32 chars
Root API & SSH Keys
Root API & SSH Keys
Developer SDKs & APIs
Generate secure passwords in code
See implementation examples for JavaScript, Python, and Go using cryptographically secure CSPRNG libraries.
// Modern Web Crypto API (Browser & Node.js 16+)
function genPassword(length = 16) {
const chars =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!@#$%^&*()_+-=";
const buf = new Uint32Array(length);
crypto.getRandomValues(buf);
return Array.from(buf, (n) => chars[n % chars.length]).join("");
}
console.log(genPassword());View implementation guidesCSPRNG / WebCrypto
Got Questions?
Frequently Asked Questions
No. ToolPorta executes 100% locally inside your browser sandbox via standard
window.crypto.getRandomValues(). No password strings, seed values, or device identifiers ever touch any remote server, database, or analytics collector.Unlike
Math.random() which relies on predictable pseudo-random sequences, this tool uses the Web Crypto API which connects to the host OS kernel CSPRNG (/dev/urandom on Unix/macOS, BCryptGenRandom on Windows). A rejection-sampling algorithm eliminates modulo bias when selecting characters.When using a password manager like 1Password, Bitwarden, or KeePass, choose 20 to 24 characters. Because you don't need to manually type or memorize the key, longer strings deliver exponential resistance against brute force attempts.