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().
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Hashing…
How to use
- 1 Pick Text or File mode.
- 2 Type / paste text, or choose a file (≤ 50 MB).
- 3 Pick output encoding (hex for Ethereum use, Base64 for general).
- 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.
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.
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