Hashes hash-wasm hash

Keccak256 Hash Generator

Generate Ethereum-compatible Keccak-256 hashes for blockchain and smart contracts.

keccak-256.workspace
1 option
0 bytes UTF-8, Hex, Base64, or File input
Options

Secure client-side computation. No data leaves your browser. Privacy Security

Result Output

What Is Keccak-256?

Keccak-256 is the Ethereum blockchain's hash function, differing from SHA3-256 only in padding, producing a 256-bit hash using the original Keccak submission (capacity 512, rate 1088).

Specifications

Output Size 256 bits
Standard Keccak submission to NIST SHA-3 competition
Standard Year 2008

Use Cases

  • Ethereum address and transaction hashing
  • Smart contract development
  • Blockchain and DApp applications
!

Security Notice

Keccak-256 is suitable for cryptographic integrity checks and fingerprints when used appropriately. Use HMAC or KMAC when you need message authentication, and use a dedicated KDF such as Argon2, bcrypt, or scrypt for password storage.

Related Tools

SHA3-256 Hashes SHA-256 Hashes Keccak-512 Hashes

Utilities

File Hash Verifier Verify local files against published checksums. Hash Compare Compare expected and actual digest values. Multi Hash Generator Generate common hashes from one input.

Guides

Algorithm Comparison Guide Choose the right primitive for each task. Hash Test Vectors Compare known outputs across common algorithms.

Implementation Notes

Practical usage details for this browser-based Keccak-256 tool.

How to Generate a Keccak-256 hash

  1. Choose UTF-8, Hex, Base64, or File input mode.
  2. Enter text, encoded bytes, or choose a local file to process.
  3. Adjust the Keccak-256 options if your use case requires non-default settings.
  4. Click Generate Keccak-256 Hash and copy the result.

Example Input and Output

Sample input:

abc

Sample output:

4e03657aea45a94fc7d47ba826c8d667c0d1e6e33a64a036ec44f58fa12d6c45

When Not to Use Keccak-256

  • Do not use a plain hash or derivation output directly as password storage without the right password-hashing construction and parameters.

Recommended Alternatives

Review related tools when you need a different output size, security margin, or keyed construction.

Keccak-256 Test Vectors

Input: empty string

c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470

Input: abc

4e03657aea45a94fc7d47ba826c8d667c0d1e6e33a64a036ec44f58fa12d6c45

Command Line Alternatives

cast keccak "abc"
node -e "console.log(require('ethers').keccak256(Buffer.from('abc')))"

File Verification Scenario

Keccak-256 is mainly used for Ethereum-style byte hashing, smart contract workflows, and compatibility with pre-standard SHA-3 systems.

Security Guidance

Keccak-256 is not the same output as SHA3-256. Confirm the expected padding and input encoding before comparing values.

Contextual Links

Use the Keccak-256 algorithm pageCompare with SHA3-256Compare Keccak outputs Privacy Security

Frequently Asked Questions