Grøstl Hash Generator

Generate Grøstl hashes from text strings, files, or other content types with our secure online tool

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Multiple Hash Sizes

Generate Grøstl-224, Grøstl-256, Grøstl-384, and Grøstl-512 hashes

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SHA-3 Finalist

Based on AES design principles, highly secure and efficient

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1-Click Copy

Copy generated hash to clipboard with a single click

🔒 Client-Side Processing
All hashing is done in your browser using JavaScript. Your data never leaves your device, ensuring maximum privacy and security.

Text Input

File Upload

Enter text to hash

Upload a file to hash

Select Hash Size:

Your Grøstl hash will appear here...

💡 For developers: Grøstl implementation examples:

// JavaScript (using crypto-js library)

const hash = CryptoJS.Grostl("text", 256);

// Generate Grøstl-256 hash using CryptoJS

hash.toString(CryptoJS.enc.Hex);

// Convert to hexadecimal string

About Grøstl Hash Algorithm

Grøstl is a cryptographic hash function that was one of the five finalists in the NIST SHA-3 competition. It was designed by a team of cryptographers including Lars Knudsen and others. Grøstl uses the same components as the AES block cipher and produces hash values of 224, 256, 384, or 512 bits.

Grøstl Hash Characteristics

✅ Security Status: Grøstl is considered cryptographically secure and was a finalist in the SHA-3 competition. It provides strong security properties and is suitable for security-sensitive applications.

Grøstl Algorithm Variants

Variant	Output Size	Security Level	Internal State
Grøstl-224	224 bits	112 bits	512 bits
Grøstl-256	256 bits	128 bits	512 bits
Grøstl-384	384 bits	192 bits	1024 bits
Grøstl-512	512 bits	256 bits	1024 bits

Grøstl vs Other Hash Algorithms

Algorithm	Output Sizes	Security Status	Design
Grøstl	224, 256, 384, 512	Secure	AES-based, wide-pipe
SHA-256	256	Secure	Merkle-Damgård
SHA-3	224, 256, 384, 512	Secure	Sponge construction
BLAKE2	256, 512	Secure	HAIFA construction

💡 Note: While Grøstl is a secure and well-designed algorithm, SHA-3 (Keccak) was ultimately selected as the winner of the NIST competition. For maximum interoperability, SHA-3 might be preferred in some contexts, but Grøstl remains an excellent choice for cryptographic applications.