Keccak-256 Hash Generator — Free & Private

A free edge API by formatho.com, privacy-first developer tools.

Free, no signup, runs entirely in your browser — your data never leaves your device.

🔓 Free🔒 Zero tracking🚫 No data collection⚡ Edge-fast

Usage

curl "https://keccak256-formatho.filesformatho.workers.dev/api?text=hello"
# → { "keccak256": "1c8aff950685c2ed4bc3174f3472287b56d9517b9c948127319a09a7a36deac8", ... }

curl "https://keccak256-formatho.filesformatho.workers.dev/api?hex=0x68656c6c6f"   # raw bytes, optional 0x prefix

Hash UTF-8 text (text) or raw bytes (hex). GET or POST JSON — {"text": "…"} / {"hex": "…"}. Inputs up to 16 KB.

Note: this is the original Keccak padding used across the Ethereum stack (Solidity keccak256(), EVM SHA3 opcode, EIP-55 address checksums, ENS namehash) — not the FIPS-202 SHA3-256 variant (SHA3-256 of "hello" is a different value).

Full parameter reference: /api endpoint.

Privacy-first: hashing happens in-memory at the edge and your input is never logged or stored.

Full browser tool

Hash keccak-256 entirely client-side: Keccak-256 Generator on formatho.com.

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