100% Client-Side

SHA-3 Hash Generator

Generate SHA-3 (Keccak) hashes — the NIST standard successor

Free Client-Side No Login No Storage
Loading tool...
SHA-256 Hash Generator Generate SHA-256 cryptographic hashes instantly — Hex or Base64 output SHA-512 Hash Generator Generate SHA-512 cryptographic hashes — stronger than SHA-256 MD5 Hash Generator Generate MD5 checksums — fast, widely supported, not for passwords

How to Use the SHA-3 Hash Generator

  1. Enter or paste text into the input field.
  2. Select the bit length (224, 256, 384, or 512).
  3. Choose Hex or Base64 output format.
  4. Click Generate Hash to compute the SHA-3 digest.

SHA-3 (Keccak) is the newest member of the Secure Hash Algorithm family. It provides an alternative to SHA-2 with a completely different internal structure, offering defence-in-depth against future cryptanalytic advances.

What is SHA-3 Hashing?

SHA-3 (Secure Hash Algorithm 3) is the latest member of the Secure Hash standard, released by NIST in 2015. Unlike SHA-1 and SHA-2 which rely on the Merkle-Damgård construction, SHA-3 is based on the innovative Keccak sponge construction. It provides fundamental structural security differences that remain completely unaffected by length-extension attacks.

Common Uses

  • Next-generation cryptographic signatures and blockchain protocols (such as Ethereum)
  • Hardened file hashing and document integrity validation immune to length-extension
  • High-assurance aerospace, defense, and enterprise data authentication pipelines
  • Hardware-accelerated cryptography on modern security coprocessors

Frequently Asked Questions

Is SHA-3 better or more secure than SHA-256?

Both SHA-256 and SHA-3 are cryptographically secure with zero known practical vulnerabilities. However, SHA-3 uses the sponge construction, which makes it natively immune to length-extension attacks without requiring HMAC.

What is the difference between Keccak and NIST SHA-3?

NIST SHA-3 is based on Keccak but includes specific domain separation padding bytes. Standard Ethereum implementations use the original Keccak-256, while NIST SHA-3-256 is the official US federal standard.

Does SHA-3 require a secret key?

Standard SHA-3 is an unkeyed cryptographic hash function. For keyed message authentication, you can use KMAC, which is built directly on Keccak sponge primitives.

Notes from this implementation

Keccak, not a SHA-2 setting

This select box calls CryptoJS SHA3 with outputLength of 224, 256, 384, or 512. That is the NIST SHA-3 function (Keccak with the SHA-3 domain padding), not SHA-512 and not the pre-standard “Keccak” hashes some coins still use. Those older hashes differ in the padding byte. A digest that matched an Ethereum-style Keccak-256 tool will not match SHA3-256 here, and that mismatch is expected.

What to compare

Pick SHA3-256 and hash hello. You should get 64 hex characters, the same width as SHA-256, and a completely different value. Same width does not mean the algorithms are interchangeable. Record the algorithm name next to the digest in any note you keep, or the next person will paste it into the SHA-256 box and declare the file corrupt.

SHA-3 is the one to reach for when a standard says “SHA-3.” It is not a drop-in upgrade that makes an old SHA-1 protocol safe. The protocol has to name the new function.