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Keccak-256 Hash Generator — Ethereum & Solidity keccak256() Digest

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 Updated

— %

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.

What is Keccak-256 Hash Generator?

A Keccak-256 Hash Generator is a tool that computes the Keccak-256 digest of text or files, the hash function used throughout Ethereum. It produces output matching Solidity's keccak256(), which differs from the finalized NIST SHA-3 standard, and supports uses such as deriving function selectors. The hashing runs entirely client-side in the browser, so input never leaves the device.

Features

Ethereum-accurate

Matches Solidity keccak256() and Ethereum function selectors, not NIST SHA3-256.

Text or files

Hash UTF-8 text or drop in any file; output is 64 hex characters (32 bytes).

Derive selectors

Take the first 4 bytes of a hashed function signature to get an ABI function selector.

100% private

Runs client-side — input never leaves the device.

Example

Input

Zerethon

Output

e9bf52c801bc093181dc8c69fb9b06b6bcd4d09c9c642c679ccff08fc1ee8f7d

Common use cases

  1. 1

    Compute a function selector

    Hash a signature like transfer(address,uint256) and take the first 4 bytes for ABI encoding.

  2. 2

    Verify on-chain hashes

    Reproduce a keccak256 value emitted by a smart contract to confirm off-chain data.

  3. 3

    Commit-reveal schemes

    Generate the Keccak-256 commitment of a value before revealing it later.

Summary

Zerethon's Keccak-256 generator computes the 256-bit Keccak digest of text or files in your browser — the exact hash Ethereum and Solidity's keccak256() use. It is the original Keccak submission, which differs from NIST's finalized SHA3-256 by one domain-separation padding byte, so the two produce different digests for the same input. Nothing is uploaded.

Category
Web3
Pricing
Free
Privacy
Browser-based
Signup
Not required

References

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.

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