Argon2 Password Hash Generator & Verifier - Secure Hashing Online

Argon2 Password Hash Generator



Generate and verify secure password hashes using Argon2id - the winner of the Password Hashing Competition.

PHC Competition Winner


Generate Hash

Argon2id

Argon2id combines benefits of both i and d variants.

Default: 64 MB

Default: 3

Threads to use

Default: 32 (256-bit)

Argon2 Hash (PHC Format)
Computation Time

Verify Hash

Verification

Paste the full hash string including the $argon2 prefix.

Verification Result

Enter the password and hash to verify.

Argon2 - Modern Password Hashing

Argon2 is a key derivation function that won the Password Hashing Competition (PHC) in 2015. It provides superior defense against GPU cracking attacks and is recommended by OWASP.

Argon2 Variants Comparison

Variant Best For Description Recommendation
Argon2id General password hashing Hybrid approach: uses Argon2i for first half, Argon2d for second half Strongly Recommended
Argon2i Side-channel attack resistance Data-independent memory access pattern Specialized Use
Argon2d Cryptocurrency mining Data-dependent memory access, faster but vulnerable to side-channel Limited Use

Recommended Parameters (OWASP 2023)

Use Case Memory (m) Iterations (t) Parallelism (p)
Minimum Security 19 MB 2 1
Standard (Default) 64 MB 3 1
High Security 1 GB 4 4

Performance Note: Higher memory and iteration values provide better security but increase computation time. The default values (64MB, 3 iterations) take approximately 0.5-1 second on modern hardware.

PHC String Format

Argon2 hashes use the PHC (Password Hashing Competition) string format:

$argon2id$v=19$m=65536,t=3,p=1$c2FsdHNhbHRzYWx0c2FsdA$WxK8SDVyNpCThLlC... Structure: |-- $argon2id = Algorithm (argon2id, argon2i, or argon2d) |-- $v=19 = Version (19 = 0x13) |-- $m=65536 = Memory in KB (64 MB) |-- ,t=3 = Time cost (iterations) |-- ,p=1 = Parallelism (threads) |-- $c2Fsd... = Salt (Base64 encoded) +-- $WxK8S... = Hash (Base64 encoded)

Usage Example

// Node.js with argon2 package const argon2 = require('argon2'); // Hash a password const hash = await argon2.hash('myPassword', { type: argon2.argon2id, memoryCost: 65536, // 64 MB timeCost: 3, // 3 iterations parallelism: 1 }); // Verify password const isValid = await argon2.verify(hash, 'myPassword'); console.log(isValid); // true
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