Online Keccak-256 Hash Generator
Keccak-256, the standard hash in the Ethereum ecosystem. Paste your text and click the button to compute its Keccak-256 hash — everything runs on your device and is never sent to a server.
Everything runs in your browser. Your data is never sent to our servers.
Example
Example Input
hello world
Example Output
47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad
How to Use
- 1Type or paste the text you want to hash into the Input field.
- 2Click the Generate Hash button (or press Ctrl+Enter) to compute the Keccak-256 hash.
- 3The Keccak-256 hash appears in the Output field. Click Copy to copy it to your clipboard.
- 4Click Clear to empty the fields and start over.
About Keccak-256
Keccak-256 is a hash function from the Keccak family — the algorithm that won the NIST hash competition and was later standardized as SHA-3. Keccak-256 produces a 256-bit hash value.
Important: the "original" Keccak differs from official SHA-3 only in the padding byte (domain separation). As a result, Keccak and SHA-3 hashes of the same input are NOT identical. Both use the same sponge construction and Keccak-f permutation.
Keccak-256 (especially Keccak-256) is widely used in the Ethereum blockchain ecosystem for addresses, signatures, and internal hashing — predating the finalized SHA-3. If you work with Ethereum/Solidity, use Keccak, not SHA-3.
FAQ
What is the difference between Keccak-256 and SHA3-256?
Both use the same core algorithm, but their padding byte differs, so their hashes differ for the same input. Ethereum uses Keccak-256 (the original version), not SHA3-256.
How long is a Keccak-256 hash?
A Keccak-256 hash is 256-bit long (64 karakter heksadesimal / 64 hexadecimal characters).
Is my data sent to a server?
No. The Keccak-256 hash is computed entirely in your browser. The text you enter never leaves your device.