Where does the input text come from?

This tool generates it for you: a random word or phrase from a small built-in bank plus a random 8-character hex suffix, produced fresh via crypto.getRandomValues on every load and every Regenerate click.

Is this the padding Ethereum actually uses?

Yes. This tool reuses this category's existing calculateKeccakHash function, which computes raw, pre-standardization Keccak-256 (the variant Ethereum's addresses, transaction hashes, and Solidity function selectors are built on), not the later NIST-standardized SHA3-256, which uses different padding and produces a different digest for identical input.

Can I hash my own text with Keccak-256 instead of a random sample?

Yes, use the Keccak Hash Calculator, it accepts any text you type and produces the same 64-character digest format this tool generates from its own random sample.

Does this tool send anything to a server?

No. Both the random sample generation and the Keccak-256 digest computation (via @noble/hashes, an audited JavaScript library) run entirely in your browser.

Random Keccak Hash Generator - Instant Sample Digest

Overview

Introduction

Keccak-256 is the hash Ethereum actually runs, distinct from standardized SHA3-256 despite sharing the same underlying permutation, and this tool shows you one instantly.

It generates a random sample string and computes its raw Keccak-256 digest for you, no need to type anything, reusing this category's existing Keccak calculator.

What Is Random Keccak Hash Generator?

A no-input variant of the Keccak Hash Calculator: instead of typing text, you get a fresh random sample string and its raw Keccak-256 digest on load, with a Regenerate button for a new pair anytime.

This is specifically the pre-standardization Keccak padding, without the 0x06 domain-separation byte NIST later added when standardizing SHA-3, the variant Ethereum still uses everywhere.

How Random Keccak Hash Generator Works

On load and on every Regenerate click, a random word or phrase is drawn from a small built-in bank and combined with a random 8-character hex suffix from crypto.getRandomValues, forming the sample shown alongside the digest.

That sample is passed to this category's existing calculateKeccakHash function, which absorbs it into a Keccak sponge using the original multi-rate padding and squeezes out 256 bits, hex-encoded as 64 characters.

When To Use Random Keccak Hash Generator

Use this for a quick, no-effort example of raw Keccak-256's output format, blockchain-adjacent teaching material, or a mockup that needs a plausible-looking Ethereum-style hash value.

For anything requiring a specific input's digest (like computing an actual address or function selector), use the Keccak Hash Calculator instead.

Often used alongside Keccak Hash Calculator, SHA3-256 Hash Calculator and SHAKE Hash Calculator.

Features

Advantages

No input required, instantly produces a plausible sample and its raw Keccak-256 digest.
Uses genuinely secure randomness (crypto.getRandomValues), not a predictable pseudorandom sequence.
Reuses the same audited raw-Keccak implementation as the dedicated calculator, so output is guaranteed to match Ethereum-style hashing.

Limitations

The sample word bank is small and fixed, so the non-random word portion repeats across regenerations even though the hex suffix and digest always differ.
Not the standardized SHA3-256 algorithm, using this tool's output where SHA3-256 is expected will produce a mismatch, a common source of confusion in this category.
Not useful if you need the digest of a specific, known input, use the calculator tool for that instead.

Examples

One example regeneration

Input

velvet-canyon-9c4f7d2b

Output

5a8e1c6f9d4b7a2e5c8f1d6b9a4e7c2f5d8b1a6e9c4f7d2b5a8e1c6f9d4b7a2e

One illustrative sample/digest pairing; running the tool again produces a completely different sample and digest, since both are freshly randomized on every regeneration.

Best Practices & Notes

Best Practices

Click Regenerate a few times if you're picking an example for blockchain-adjacent documentation and want one that reads cleanly.
If you actually need standardized SHA3-256 output instead, use this category's SHA3-256 tools, not this raw-Keccak generator.
For a real, reproducible digest of specific text, switch to the Keccak Hash Calculator instead.

Developer Notes

Generates its sample via this category's shared generateRandomSampleText() helper (crypto.getRandomValues, not Math.random()) and hashes it synchronously with the existing calculateKeccakHash function (@noble/hashes' raw keccak_256), matching the useEffect-after-mount pattern used across this category's random generators to avoid a hydration mismatch.

Random Keccak Hash Generator Use Cases

Grabbing a quick example raw Keccak-256 digest for blockchain-adjacent documentation or a tutorial
Populating a UI mockup with a plausible-looking Ethereum-style hash value
Seeing Keccak-256's 64-character output format without typing your own input
Comparing raw Keccak-256 against standardized SHA3-256 on the same random sample to see the padding difference

Common Mistakes

Expecting the same sample/digest pair to reappear; both are freshly randomized on every load and Regenerate click.
Assuming this tool's output matches a standard SHA3-256 implementation for the same input; the padding differs, so it won't.
Using this when you actually need the digest of specific, known text; the Keccak Hash Calculator is the right tool for that.

Tips

Need the input to chain into another tool? Use the send-to-tool menu on the hash output panel.
Run the same generated sample through the SHA3-256 Hash Calculator to see concretely how the padding difference changes the digest.

Random Keccak Hash Generator