Keccak-256 Hash Generator for Ethereum and Smart Contracts
This Keccak-256 hash generator computes the original Keccak hash from the content you enter. It is not interchangeable with NIST SHA3-256: Keccak uses 0x01 padding, while SHA-3 uses 0x06, so the resulting hashes differ. Enter your input, adjust the available options, and copy the result; use the Multi-Hash tool to compare both algorithms side by side.
The Keccak-256 hash generator computes the original Keccak hash from content you enter in the browser. It is useful when a development workflow specifically requires Keccak-256, including Ethereum and many smart-contract tools. This algorithm is not the same as the NIST SHA3-256 standard, even though their names and underlying Keccak family can lead to confusion.
The key distinction is the padding used to process input: Keccak-256 uses 0x01, while SHA-3 uses 0x06. Because of this difference, the two algorithms produce different hashes for the same input. Enter or drop your content, adjust the options available in the tool, and copy the resulting Keccak-256 hash. To inspect the difference, compare both algorithms side by side with the Multi-Hash tool.
Use Keccak-256 when a project or tool calls for the original Keccak variant; use NIST SHA3-256 when that standard is required. Hashing is not a format conversion that can be reversed to recover the original content, so keep the distinction in mind when checking expected results or debugging a mismatch.
The tool runs entirely in your browser: your input is processed on your device and is not uploaded, stored, or sent to a server. It works offline once the page has loaded, and it is free to use. Developers and DevOps engineers can use it for quick checks across different machines without installing local software or sending internal data to an online service.
Step 1: Paste or enter the content you want to hash. You can also drop your content into the tool.
Step 2: Review and adjust the available options before computing the hash.
Step 3: Check the Keccak-256 result displayed by the tool. Remember that it differs from NIST SHA3-256.
Step 4: Copy the result, or use the Multi-Hash tool to compare Keccak-256 and SHA3-256 side by side.
Use case: Generate a Keccak-256 hash for a smart-contract development task. Ethereum and many smart-contract tools use Keccak-256, so choosing the correct hash matters.
Use case: Check whether a workflow expects Keccak-256 or NIST SHA3-256. The tools use different padding and produce different results.
Use case: Handle a routine Keccak-256 task without installing anything locally. Enter your content in the browser and copy the result.
Use case: Work from a machine where you cannot install local software. The browser-based tool lets you compute a hash without a local installation.
Use case: Avoid pasting internal content into a third-party service. The tool processes your input in your browser and does not send it to a server.
Use case: Compare Keccak-256 with SHA3-256 while investigating a hash mismatch. The Multi-Hash tool displays the two results side by side.