YoSin Tools

Keccak-256 File Hash Calculator

Compute the Keccak-256 (Ethereum's keccak256) checksum of any file in your browser. Original pre-NIST Keccak, 256-bit output. No upload, complete privacy.

File Input
File
Drag and drop a file here, or click to select. Processed locally — never uploaded.
Output
Settings
Calculate

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Frequently Asked Questions

How do I verify a Keccak-256 file checksum?
Drop your file into the input zone. The Keccak-256 hash is computed and displayed as a 64-character hex string.
Is this the same as Ethereum's keccak256?
Yes. This tool computes the same Keccak-256 used by Ethereum, web3.js, and ethers.js.
Is my file sent to any server?
No. Everything is processed locally in your browser. Nothing is transmitted.

About Keccak-256 File Hash Calculator

Compute the Keccak-256 checksum of any file entirely in your browser. This is the same Keccak-256 used by Ethereum (web3.js utils.keccak256, ethers.js, Solidity's keccak256()). All file processing is local — no data leaves your device.