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Authorized use only. Use this tool solely on systems, tokens, and assets you own or are explicitly permitted to test — credential extraction, signature forging, and unauthorized access are prohibited by our Acceptable Use Policy.

Argon2id Hash Generator & Online Hashing Tool

Generate Argon2id, bcrypt, PBKDF2, MD5, SHA-1, SHA-256, SHA-384, SHA-512, BLAKE2b, and Poseidon hashes. 100% client-side - your data never leaves your browser.

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Frequently Asked Questions

Learn about Argon2id and password hashing

What is Argon2id and why is it the best password hash?

Argon2id is the winner of the 2015 Password Hashing Competition. It's memory-hard, ASIC-resistant, and specifically designed for password storage. Unlike bcrypt or PBKDF2, Argon2id requires significant memory to compute, making it extremely resistant to GPU and ASIC attacks. The "id" variant combines data-independent and data-dependent hashing for maximum security against both side-channel and brute-force attacks.

Is this Argon2id hash generator secure and private?

Yes! All hashing happens 100% client-side in your browser using the argon2-browser library (WASM). Your passwords are never sent to any server. The Argon2id computation runs entirely in your browser's JavaScript engine, ensuring maximum privacy. We use WebAssembly for performance - the same technology used by modern web apps.

How does Argon2id compare to bcrypt and PBKDF2?

Argon2id is the modern recommendation (NIST SP 800-63B) for password storage. Bcrypt has been the standard since 1999 but is vulnerable to GPU attacks. PBKDF2 is widely used but slower and less secure than memory-hard algorithms. Argon2id combines the best of both - it's memory-hard (resists GPU/ASIC attacks) and data-dependent (resists side-channel attacks). For new applications, always use Argon2id.

What are the recommended Argon2id parameters?

Our tool uses secure defaults: timeCost=3, memoryCost=64MB, parallelism=1, hashLength=32 bytes. For production use, adjust based on your security requirements. Higher memory usage provides better GPU resistance but takes longer. The OWASP Password Storage Cheat Sheet provides detailed guidance on parameter selection.

Can I use this for hashing passwords in production?

Yes! This tool produces valid Argon2id hashes that can be verified using any Argon2 library (argon2-cffi for Python, argon2 for Node.js, etc.). The output is in the PHC format: $argon2id$v=19$m=65536,t=3,p=1$... This is the standard format compatible with most password verification libraries.

What is BLAKE2b and why is it faster than SHA-256?

BLAKE2b is a cryptographic hash algorithm that's faster than MD5 yet more secure than SHA-256. It was designed in 2012 as a successor to BLAKE (a SHA-3 finalist). BLAKE2b is used in Zcash, WireGuard, and as the internal hash for Argon2. It's perfect for checksums and hashing when performance matters but you still need cryptographic security.

What is Poseidon hash and where is it used?

Poseidon is a zero-knowledge proof (ZKP) optimized hash function. It uses the Hades permutation design to minimize the number of multiplications in finite fields, making it ideal for zkSNARKs and zkSTARKs. Poseidon is used in privacy protocols like Filecoin, Mina, and StarkNet where efficient hashing within zero-knowledge proofs is critical.

Why are MD5 and SHA-1 included if they're cryptographically broken?

MD5 and SHA-1 are included for legacy compatibility and checksum purposes only. Never use them for password storage or cryptographic applications. MD5 has known collision vulnerabilities since 2004, and SHA-1 has been deprecated since 2017. Use Argon2id for passwords, and SHA-256 or BLAKE2b for other cryptographic needs.

About the Hash Text

Generate hashes online - SHA-256, SHA-512, Argon2id, bcrypt, PBKDF2, and more - from any text. Free and private: a client-side hash generator where passwords and secrets are processed in your browser and never uploaded.

Hash functions convert input into a fixed-length fingerprint used for integrity checks, deduplication, password storage, and content addressing. SHA-256 remains the general-purpose default, while Argon2id and bcrypt are the modern standards for password hashing because they are deliberately slow and memory-hard.

Generate SHA-1, SHA-256, SHA-384, SHA-512, MD5, Argon2id, bcrypt, PBKDF2, BLAKE2b, and Poseidon hashes from any text. All hashing runs in your browser — passwords and secrets never touch a server.

Use cases and examples

Hash a password with Argon2id before storing it, choosing parameters your production system uses.

Verify a file download or message integrity by comparing SHA-256 digests.

Generate deterministic test fixtures - hashing a known input gives a stable identifier across environments.

How to use

  1. Type or paste the text to hash.
  2. Choose the algorithm you need for your use case.
  3. The hash appears instantly and updates as you type.
  4. Copy the hex or base64 digest for checksums or storage.

Frequently Asked Questions

What hash algorithms are available? ▾

Formatho supports MD5, SHA-1, SHA-256, SHA-384, SHA-512, BLAKE2b, Argon2id, bcrypt, and PBKDF2 — all computed locally in your browser.

Can I use this for password hashing? ▾

Yes. Use Argon2id or bcrypt for password hashing. These are slow key-derivation functions designed to resist brute-force attacks.