Argon2 Password Hash Generator & Verifier (Argon2id)

Argon2id is the recommended password hashing algorithm for modern backend applications. Use this Argon2 password hash generator and verifier to test authentication flows, validate stored hashes, and understand how memory, iterations, and parallelism impact password security. The tool is designed for accuracy, productivity, and secure-by-default usage in real-world systems.

🔐 Argon2id Hash

Password Salt Salt size: 16 bytes (128-bit, hex)

Memory (MB) Iterations Parallelism Hash Length (bytes)

Encoded Hash

{{vm.hashResult.encoded}}

Execution Time: {{vm.hashResult.timeMs}} ms

✅ Verify Hash

Stored Argon2id Hash Password

Result: {{vm.verifyResult.valid ? 'Valid' : 'Invalid'}}

Security Analysis

⚠ {{w}}

✔ No obvious weaknesses detected

Security Level: {{vm.security.level}}

We do not store, log any key you enter. This tool is intended for personal and educational use. We suggest not to use online tools to protect real production secrets.

Key Terminologies

What is a Key Derivation Function?

A key derivation function (KDF) transforms a password into a cryptographically secure key using techniques such as salting and iteration. KDFs are designed to slow down attackers attempting brute-force or dictionary attacks.

What is Argon2?

Argon2 is the winner of the Password Hashing Competition and is designed to be memory-hard, making it resistant to GPU and ASIC-based attacks. Argon2id is the recommended variant for password hashing.

Why Argon2id?

Argon2id is the recommended password hashing algorithm for modern applications due to its resistance against GPU, ASIC, and side-channel attacks. By combining the strengths of Argon2i and Argon2d, it offers a balanced defense suitable for web applications, APIs, and backend services. This tool demonstrates how to use Argon2id the right way.

Security Best Practices

Always store hashed passwords, never plaintext passwords
Use a unique random salt for every password
Prefer Argon2id for all new applications
Increase cost parameters over time as hardware improves

Tool Usage

This online Argon2id Hash and Verify tool helps backend developers generate and validate password hashes using correct, production-grade parameters.

It is designed to improve both developer productivity and cryptographic accuracy by exposing real Argon2id settings such as memory cost, iterations, parallelism, salt, and hash length in a transparent and educational way.

Argon2id Password Hashing in Node.js

The following example demonstrates how to securely hash and verify passwords using Argon2id in Node.js. These parameters closely match recommended production defaults and align with the settings used in this tool.

Install Dependency


npm install argon2

Generate Argon2id Hash


const argon2 = require('argon2');

async function hashPassword(password) {
  const hash = await argon2.hash(password, {
    type: argon2.argon2id,
    memoryCost: 64 * 1024,   // 64 MB
    timeCost: 3,             // iterations
    parallelism: 1,          // lanes
    hashLength: 32,           // bytes
    saltLength: 16            // bytes
  });

  return hash; // $argon2id$v=19$m=65536,t=3,p=1$...
}

Verify Password


async function verifyPassword(storedHash, password) {
  const isValid = await argon2.verify(storedHash, password);
  return isValid;
}

Example Usage


(async () => {
  const password = 'CorrectHorseBatteryStaple';

  const hash = await hashPassword(password);
  console.log('Encoded hash:', hash);

  const valid = await verifyPassword(hash, password);
  console.log('Password valid?', valid);
})();

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