Keccak256 Hash Generator
Compute the Keccak-256 hash of any text or hex data. The hash function used throughout Ethereum.
Keccak256 Hash Generator
Compute the Keccak-256 hash of any text or hex data. This is the hash function used throughout Ethereum (addresses, storage, signatures, function selectors).
Enter input to generate hash...Keccak-256 is not the same as SHA3-256. Ethereum uses the original Keccak (pre-NIST padding).
Empty string hash: c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470
What is Keccak-256?
Keccak-256 is the cryptographic hash function used throughout Ethereum. It produces a fixed 256-bit (64 hex character) digest from any input. Ethereum uses it to derive contract addresses, compute function selectors, index storage slots, sign messages, and hash transaction data.
Note that Ethereum uses the original Keccak padding scheme, which differs slightly from the finalized NIST SHA-3 standard — hashing the same input with SHA3-256 and Keccak-256 produces different digests. This tool computes the Ethereum-compatible Keccak-256 variant.
Features
- Hashes plain text or raw hex input
- Produces the same digest as Solidity's keccak256() for bytes input
- Instant output — useful for verifying function selectors and event topics
- Handles large inputs entirely in the browser
- No data sent to any server — safe for sensitive payloads
When to use it
Use it when computing the 4-byte function selector for a Solidity signature (the first bytes of the Keccak-256 of "transfer(address,uint256)"), verifying event topic hashes, deriving addresses from public keys, debugging ABI-encoded calldata, or cross-checking hashes produced by web3 libraries.