Z

Keccak-256 Hash Generator

Compute Keccak-256 digest (Ethereum's hash) of text or files. Different from SHA-3 — matches Solidity keccak256().

Free No signup Client-side Privacy friendly

— %

Hashing…

How to use

  1. 1 Pick Text or File mode.
  2. 2 Type / paste text, or choose a file (≤ 50 MB).
  3. 3 Pick output encoding (hex for Ethereum use, Base64 for general).
  4. 4 Copy the 32-byte digest.

Why use this tool

  • Keccak-256 is the hash used everywhere in Ethereum — function selectors, event topics, address derivation, EIP-712 typed data.
  • Different from SHA-3-256 (different padding) — picking SHA-3 will produce a different hash than Solidity's `keccak256()`.
  • Run on text (UTF-8) or any file up to 50 MB.
  • Pure client-side — input never uploaded.

Frequently asked questions

Is Keccak-256 the same as SHA-3-256?

No. Keccak-256 was the algorithm submitted to NIST. SHA-3-256 (FIPS 202) uses a different padding scheme. Ethereum locked in pre-standardisation Keccak — Solidity's `keccak256()` is this tool, not SHA-3.

What is a function selector?

The first 4 bytes of keccak-256 over the canonical function signature, e.g. `keccak256("transfer(address,uint256)")[:4]` → `0xa9059cbb`. Use the Sample button to try it.

Why is the output 64 hex characters?

Keccak-256 outputs 256 bits = 32 bytes = 64 hex characters.

Can I hash binary data instead of text?

Yes — switch to File mode. The exact byte contents of the file are hashed (no encoding step). For hex-encoded bytes use a separate hex-decode step first.

Summary

Keccak-256 Hash Generator is a free web3 utility by Zerethon Tools. Compute Keccak-256 digest (Ethereum's hash) of text or files. Different from SHA-3 — matches Solidity keccak256(). Runs entirely in the browser — no signup, no upload.

Category
Web3
Pricing
Free
Privacy
Browser-based
Signup
Not required

Privacy

Your data never leaves your browser unless explicitly stated. Keccak-256 Hash Generator runs entirely client-side — no server upload, no logging, no tracking of your input.

Related tools

NFT Metadata Validator

Validate NFT metadata against ERC-721, OpenSea, and Solana Metaplex standards. Preview your NFT before minting.

Open tool

Wallet Address Validator

Validate Ethereum, Bitcoin (legacy + SegWit), Solana, TRON and Litecoin addresses. Format + checksum, no RPC.

Open tool

ETH Unit Converter

Convert between Wei, Gwei, Ether, Szabo, Finney and more. BigInt-safe — no rounding errors.

Open tool

EIP-55 Checksum Tool

Convert any Ethereum address to its canonical EIP-55 checksummed form. Detect typos before sending funds.

Open tool

Build, share, and grow on Zerethon Social

Free signup. Earn points, collect achievements, and connect with creators worldwide.

Try Zerethon free