ethertools.
Tools/Keccak-256
CRYPTOGRAPHY · RUNS IN YOUR BROWSER

Keccak-256 hash tool

Turn text or hex into an Ethereum-style fingerprint.

HOW THE CONCEPT WORKS · SEPARATE TEACHING EXAMPLE
From exact bytes to a Keccak-256 fingerprintStep 1 / 4
From exact bytes to a Keccak-256 fingerprintUTF-8 texthelloExact spelling mattersA hash commits to bytes, not a visual interpretationFive input bytes68656c6c6fLiteral text 0x68656c6c6f would be a different text inputInput bytes68 65 6c 6c 6f5 bytesKeccak-256Deterministic calculation32-byte resultUse Keccak-256, not an interchangeable SHA3-256 assumption0x1c8aff95…36deac8Fixed output: 32 bytesSame input bytes → same outputA fingerprint does not prove that the input is truthful or safe

The text hello is a particular sequence of characters. Case or text normalization can change the encoded bytes.

Animated local teaching model. No wallet, RPC or live blockchain data. Some labels and hashes are abbreviated for readability.

How to use this keccak-256

Calculate the Keccak-256 hash of UTF-8 text or hexadecimal bytes locally. Also inspect the first four bytes used as an Ethereum function selector. Start with the prefilled example, change an input, and run the calculation. Invalid values produce an explanation rather than a misleading result.

What the result means

These results describe your supplied inputs. They do not query a blockchain, check balances, estimate current network conditions, or submit transactions. Read hashes: fingerprints for data for the meaning and limits of the calculation.