Keccak-512 is the 512-bit variant of the original Keccak algorithm with pre-standardization padding. It produces 128 hex character hashes used in blockchain and cryptographic systems preferring the original Keccak specification.

Keccak-512 vs SHA3-512: actual difference?

Only the padding rule differs — Keccak-512 uses pad10*1 while SHA3-512 uses a domain-separated variant. The internal Keccak-f[1600] permutation and security are identical.

Should I use Keccak-512 for new projects?

SHA3-512 is generally recommended as the NIST standard. Use Keccak-512 only when working with systems that explicitly depend on the original Keccak specification.

Where is Keccak-512 commonly used?

In blockchain and cryptocurrency projects adopted before NIST SHA-3 standardization. Some zero-knowledge proof systems use it for its well-studied properties.

Is Keccak-512 secure?

Yes. Both Keccak-512 and SHA3-512 share the same extensively analyzed Keccak-f permutation. The padding difference does not affect security.

Tools

Keccak-512|128 hex chars

Input

Output

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Keccak-512 Hash Generator — Full Original Keccak Output

The full 512-bit output of the original Keccak algorithm. Used in blockchain projects and cryptographic applications requiring high-security hashing with pre-NIST padding.

Features

✓Compute Keccak-512 hashes online — the full 512-bit output of the original Keccak algorithm
✓Real-time 512-bit hash computation with 128 hex character output
✓One-click copy, download as .txt, and uppercase/lowercase toggle
✓Uses original Keccak padding (not NIST SHA-3 padding) for pre-standard compatibility
✓Hash verification against known Keccak-512 checksums
✓100% browser-based with zero server uploads

How to Use

1Type or paste your text into the input box above.
2Your hash digest appears instantly — no page reload needed.
3Toggle UPPERCASE / lowercase to change the hex output format.
4Click the copy icon to copy the hash to clipboard, or use Download to save as .txt.
5Paste an expected hash into the Verify field to check for a match.

Frequently Asked Questions

Related Tools

Keccak-256 Hash Tool — Ethereum Smart Contract Hashing

The hashing engine of Ethereum — powers every smart contract transaction and message signature (EIP-191). Uses original Keccak padding, producing different output than SHA3-256.

SHA3-512 Hash Calculator — Maximum Keccak Sponge Output

The largest SHA-3 variant at 512 bits. Keccak-based, NIST-recommended as a cryptographically independent alternative to SHA-512.