Argon2 Hash Generator & Verifier
Generate secure Argon2 hashes and verify passwords against existing hashes. Argon2 is the winner of the Password Hashing Competition and recommended for new applications with configurable memory, time, and parallelism parameters.
Hash Generation Settings
Argon2id combines the benefits of both Argon2i and Argon2d and is recommended for most use cases.
Estimated Total Memory: 256 MB
Security Level: Moderate
Recommendation: For password storage, use at least 64MB memory cost with Argon2id.
Generated Hash
Generated hash will appear here
Enter a password and click "Generate Hash" to start
About Argon2
Argon2id: Hybrid mode, resistant to both side-channel and GPU attacks (recommended)
Argon2i: Optimized for password hashing, resistant to side-channel attacks
Argon2d: Optimized for cryptocurrency, resistant to GPU attacks
Memory Cost: Amount of memory used (higher = more secure)
Time Cost: Number of iterations (higher = slower but more secure)
Parallelism: Number of parallel threads used
About Argon2 Hash Generator & Verifier
The Argon2 Hash Generator & Verifier is a state-of-the-art security tool that creates Argon2 password hashes and verifies passwords against existing Argon2 hashes. Argon2 is the official winner of the Password Hashing Competition (PHC) and represents the current best practice for password hashing, offering superior resistance to both GPU and ASIC-based attacks through configurable memory, time, and parallelism parameters.
Why use a Argon2 Hash Generator & Verifier?
Argon2 is officially recommended by security experts as the gold standard for new password hashing implementations because it provides the best defense against modern attack methods. Its three-dimensional cost approach (memory, time, parallelism) makes it highly resistant to specialized hardware attacks while allowing fine-tuned performance optimization. As the PHC winner, Argon2 represents the cutting edge of password security technology.
Who is it for?
Essential for modern security architects implementing next-generation authentication systems, security researchers requiring state-of-the-art password protection, and enterprise developers building new applications with maximum security requirements. Perfect for startups establishing security foundations, fintech companies handling sensitive data, and any organization prioritizing future-proof password security.
How to use the tool
Choose between Generate Hash mode (for creating new hashes) or Verify Hash mode (for checking passwords against existing hashes)
For hash generation: Enter the password you want to hash using the industry-leading Argon2 algorithm
Select the Argon2 variant based on your security requirements:
• Argon2id (Recommended - Hybrid): Combines benefits of both Argon2i and Argon2d, recommended for most use cases
• Argon2i (Data-independent): Provides side-channel attack resistance, slower but more secure against timing attacks
• Argon2d (Data-dependent): Faster execution but potentially vulnerable to side-channel attacks
Choose a configuration preset for quick setup:
• Interactive (64MB, 2 iterations, 1 thread): For real-time applications requiring fast response
• Moderate (256MB, 3 iterations, 4 threads): Balanced security and performance for backend authentication
• Sensitive (1GB, 4 iterations, 8 threads): Maximum security for high-value data protection
Configure individual parameters for custom security levels:
• Memory Cost: Controls memory usage (8MB to 2GB) - higher values resist GPU/ASIC attacks better
• Time Cost: Number of iterations (1-10) - more iterations increase computation time
• Parallelism: Number of threads (1-16) - affects memory bandwidth utilization
• Hash Length: Output size in bytes (16, 32, or 64 bytes) - longer hashes provide more entropy
Review the estimated total memory usage and security level before generating
Click 'Generate Argon2 Hash' to create a cryptographically secure hash with automatic salt generation
Copy the resulting Argon2 hash for implementation in your security system
For verification: Switch to Verify mode, enter the password and existing hash to check authenticity
Parameter Guidelines for different use cases:
• Interactive Applications: 64MB memory, 2-3 iterations, 1-4 threads (suitable for login forms)
• Backend Authentication: 256MB memory, 3-4 iterations, 4-8 threads (server-side processing)
• High Security Systems: 1GB+ memory, 4+ iterations, 8+ threads (maximum protection)
Performance considerations: Higher parameters provide better security but require more processing time and memory - test your configuration to ensure acceptable performance for your specific use case
Frequently Asked Questions
How do I generate an Argon2id hash safely in 2026?
Use the Argon2id variant — it's the OWASP 2024+ recommended default and the right choice for nearly every password-hashing scenario. The recommended starting parameters are m=64 MB (m=65536 KiB), t=3 iterations, p=1 parallelism — these target the 250-400ms per-hash window that's slow enough to resist brute force but fast enough not to DOS your own login endpoint. Generate a unique 16-byte cryptographic random salt per user (this tool does that automatically). Store the entire encoded output ($argon2id$v=19$m=65536,t=3,p=1$saltsalt$hashhash) in a single VARCHAR(255) column. Never roll your own; use a vetted library.
What is the difference between Argon2id, Argon2i, and Argon2d?
Argon2d is data-dependent: fastest, optimised against GPU brute force, but vulnerable to side-channel timing attacks. Argon2i is data-independent: timing-resistant, but weaker against GPU attacks (a 2016 paper showed partial breakage at low iteration counts). Argon2id is the hybrid that runs Argon2i for the first half-pass (timing-resistant) and Argon2d for the rest (GPU-resistant). RFC 9106 and OWASP both recommend Argon2id for password hashing because both attack classes apply to that use case. Use Argon2d only for key derivation (KDF), where timing attacks aren't a threat model.
Is browser-based Argon2 hashing safe?
Yes — Argon2 hashing in your browser runs locally via JavaScript/WebAssembly and never transmits your password or the resulting hash to any server. There's no API call, no logging, no telemetry. You can verify this in DevTools' Network tab: hashing produces zero requests. This is cryptographically equivalent to running the official Argon2 reference implementation locally — the algorithm is deterministic, so the output is bit-for-bit identical given the same parameters. The only attack surface unique to browser hashing is a compromised browser itself, which would equally affect any local tool you run on that machine.
Is Argon2 better than bcrypt in 2026?
For new applications, yes — Argon2id is the OWASP 2024 recommended default. The advantage isn't a bcrypt weakness (bcrypt at cost 12+ remains cryptographically sound) but that Argon2 is memory-hard: each hash needs 64+ MB of RAM, which makes GPU and ASIC attacks dramatically more expensive than against bcrypt's 4KB working set. For existing bcrypt deployments at cost 12+, there's no urgency to migrate. For greenfield projects in 2026, start with Argon2id. Use bcrypt only if you need broad legacy library support or are constrained by an existing ecosystem.
What memory cost should I use for Argon2 in 2026?
Start at m=64 MB (m=65536 KiB) — that's the OWASP 2024 recommended default. For high-security applications, go to m=128 MB (m=131072 KiB). The security parameter is roughly memory × time, so trade-offs are linear: if 64 MB × 3 iterations is too slow, try 32 MB × 6 iterations for equivalent work. Plan capacity for burst load: 100 concurrent logins at m=64 MB = 6.4 GB of memory pressure on your auth server. Below 32 MB you start losing the memory-hardness benefit that makes Argon2 stronger than bcrypt. Benchmark on production hardware, never guess.
How long should an Argon2 hash take to compute?
Target 250-400ms per hash on your production hardware. Below 100ms and brute force is too cheap — an attacker with a leaked database can try too many candidates per second. Above 1000ms and the login feels sluggish, and concurrent login bursts can starve your CPU. Benchmark with realistic conditions: same CPU model as production, no warm caches, measured under expected concurrent load. Adjust t (time cost) first if you need to tune latency without sacrificing memory-hardness. Re-benchmark every 12-24 months — hardware gets faster, so a parameter set that took 300ms in 2026 will take 150ms in 2028.
Why does my Argon2 hash include $argon2id$v=19$m=65536,t=3,p=1$ at the start?
That's the self-describing PHC string format — algorithm identifier ($argon2id$), version (v=19, which is the current Argon2 v1.3), and parameters (m=memory, t=time, p=parallelism). It's followed by the base64-encoded salt and hash. The format is what lets you store everything in a single VARCHAR(255) column and verify hashes without storing parameters separately. When you want to rotate parameters (e.g. bump memory from 64 MB to 128 MB), you can check whether stored hashes match the new parameters and rehash gradually on successful login — without forcing every user to reset their password.
Can I use Argon2 for key derivation, not just passwords?
Yes — Argon2 was designed as both a password hash and a KDF (key derivation function). For KDF use cases (deriving an encryption key from a passphrase, generating a long-lived symmetric key from a password), use Argon2d, which is faster and timing-attack resistance doesn't matter when the input isn't a password being verified. Use Argon2id when there's any chance the input might be verified later under timing constraints — when in doubt, choose Argon2id. The output length can be tuned (16/32/64 bytes) to match your downstream key size requirement (AES-256 needs 32 bytes, ChaCha20 needs 32 bytes, etc.).
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