Argon2 Hash Generator Online

Instantly create secure Argon2 hashes (Argon2i, Argon2d, Argon2id) in your browser. Argon2 is the modern, memory-hard password hashing algorithm recommended for 2025 and beyond—designed to protect against GPU/ASIC attacks and adopted by leading frameworks. Use the tool below to generate hashes, learn best practices, and compare with bcrypt/scrypt.

A developer at a workstation with code on screen, surrounded by a digital abstract of security locks and server racks—illustrating modern password hashing

Argon2 Hash Generator

Tip: For maximum security, use a long, random salt for each password. Argon2id is recommended for web applications.

How to Use the Argon2 Hash Generator: Enter your password, choose Argon2 type and parameters, and click Generate. The output is a secure, ready-to-use Argon2 hash string. You can copy it or use the code examples below to integrate Argon2 in your apps.

What is Argon2? Why Use It for Password Hashing?

Argon2 is the winner of the Password Hashing Competition (PHC) and the modern standard for secure password hashing in 2025. Unlike older algorithms, Argon2 is designed to be memory-hard, parallelizable, and resistant to GPU/ASIC attacks, making it much harder for attackers to brute-force.

Memory-Hard: Forces attackers to use lots of RAM—slows down hardware attacks (e.g., GPUs, FPGAs).
Highly Configurable: You control memory, time, and parallelism for your own threat model.
Variants: Argon2i (resistant to side-channels), Argon2d (resistant to GPU), Argon2id (hybrid, best for most uses).
Adopted by: PHP 7.2+, Python (argon2-cffi), Node.js, password managers, and standards like OWASP ASVS, NIST SP 800-63B.

Bottom line: If you're building a website, app, or password manager in 2025+, use Argon2 instead of legacy hashes like bcrypt or PBKDF2.

A digital lock and flowing data lines with a server background, representing Argon2's advanced password hashing and security

Argon2 vs Bcrypt vs Scrypt: Security & Features Comparison

Algorithm	Year	Memory-Hard?	Parallelism	GPU/ASIC Resistance	Best Use	Supported In
Argon2	2015	Yes (configurable)	Yes	Excellent	Modern apps, password managers	PHP 7.2+, Python, Node.js, .NET
Bcrypt	1999	Limited	No	Moderate	Basic web logins	PHP, Python, Node.js, .NET
Scrypt	2009	Yes (less optimal)	Some	Good	Legacy apps, some crypto	Node.js, Python, PHP

Argon2id is the current recommendation (OWASP, NIST) for password hashing in 2025.

Argon2 Hash Example Code (PHP, Python, JavaScript)

// Argon2id password hash in PHP 7.2+
$hash = password_hash($password, PASSWORD_ARGON2ID, [
    'memory_cost' => 65536, // 64 MB
    'time_cost' => 3,       // Iterations
    'threads' => 2
]);
// To verify:
if (password_verify($input, $hash)) {
    // Password is correct
}

Use password_hash for new applications. Adjust memory/time/threads for your server's capacity.

# pip install argon2-cffi
from argon2 import PasswordHasher
ph = PasswordHasher(
    memory_cost=65536, # 64 MB
    time_cost=3,
    parallelism=2
)
hash = ph.hash("mysecretpassword")
# To verify:
ph.verify(hash, "mysecretpassword")

argon2-cffi is the de facto Argon2 library for Python. Store the full hash output in your database.

// Node.js: npm install argon2
const argon2 = require('argon2');
(async () => {
  const hash = await argon2.hash('mysecretpassword', {
      type: argon2.argon2id,
      memoryCost: 65536,
      timeCost: 3,
      parallelism: 2
  });
  // To verify
  const valid = await argon2.verify(hash, 'mysecretpassword');
})();

Browser: Use argon2-browser or WebAssembly-based libraries. Note: JS Argon2 is slower than server-side.

Best Practices & Argon2 Parameter Recommendations (2025)

Use Argon2id for all new applications (OWASP, NIST recommend id variant).
Set memory_cost at least 64MB (65536 KB) for typical web logins; increase for sensitive/low-volume systems.
Time/cost should be 2–4 for web apps; higher for password managers.
Parallelism (threads): Match your server's CPU cores (commonly 2).
Salt: Always generate a new, random salt (16+ random bytes) per user/password.
Store the full hash output (includes parameters/salt/version) in your database for future verification.
Don't reuse salts or use static/guessable salts.
Test performance—aim for 100–500ms hashing time on your hardware for good security/usability balance.

Pro Tip: If users report slow logins, lower time/cost slightly, but never reduce memory below 32MB for public apps. For password managers, use much higher settings (e.g., 256MB+).

Argon2 FAQ: Answers to Common Password Hashing Questions

Yes. Argon2 is the first password hashing algorithm specifically designed to be memory-hard and highly configurable, making it much harder for attackers using GPUs or ASICs. Bcrypt is still better than plain SHA or MD5, but Argon2 is recommended for all new applications due to its resistance to modern hardware attacks, flexibility, and peer-reviewed design.

For most web logins, use Argon2id with 64MB+ memory (memory_cost=65536), time_cost=3, and parallelism=2. Increase memory and time for more sensitive systems if performance allows. Always test on your production hardware to ensure user experience is not negatively impacted. For password managers or highly sensitive data, use higher values (e.g., 256MB+, 4+ iterations).

Yes, there are WebAssembly (WASM) implementations (e.g., argon2-browser) that allow Argon2 hashing in browsers or Node.js. However, JS/WASM is generally slower and less secure than using Argon2 on the server. For best security, hash passwords on the server using a mature Argon2 library.

Salt is a random value added to each password before hashing to ensure that identical passwords produce different hashes and to defend against precomputed attacks (rainbow tables). Always use a unique, random salt per password, at least 16 bytes long. Most Argon2 libraries handle salt generation for you.

Yes. Argon2 is supported in PHP 7.2+ (password_hash), Python (argon2-cffi), Node.js (argon2), .NET, Go, Rust, and many other languages. Most major frameworks (Laravel, Django, ASP.NET) provide built-in or plugin support for Argon2 by 2025. Always store the full hash output.

Yes, you can perform a gradual migration: verify existing passwords using the old hash, and when a user logs in, re-hash their password with Argon2 and store the new hash. Over time, your user base will transition to Argon2 hashes without disrupting logins.

Argon2 Hash Generator Online