SHA3-256 is the 256-bit member of the SHA-3 family (FIPS 202, 2015). It uses the Keccak sponge construction — the same output size as SHA-256 but with a fundamentally different internal design.

SHA3-256 vs SHA-256: which should I use?

Both provide 128-bit security. SHA-256 has wider adoption and hardware support. SHA3-256 offers cryptographic diversity — using both provides defense-in-depth. For new projects, either is acceptable.

Why is SHA3-256 important for security?

Cryptographic monoculture is a risk. SHA3-256 provides an alternative based on completely different mathematics (Keccak sponge), ensuring system resilience even if SHA-2 weaknesses are discovered.

Does SHA3-256 have advantages over SHA-256?

SHA3-256 is immune to length-extension attacks (SHA-256 requires HMAC for this). It also supports SHAKE extendable-output functions through the same Keccak core.

Is SHA3-256 used in blockchain?

Ethereum 2.0 uses SHA-256 for its beacon chain. Some newer blockchain projects adopt SHA3-256 for its modern security properties and resistance to potential SHA-2 attacks.

Tools

SHA3-256|64 hex chars

Input

Output

Hash result will appear here...

0 chars|0 bytes

SHA3-256 Hash Calculator — NIST 3rd Gen Keccak Standard

NIST third-generation hash standard with 256-bit output. Built on the Keccak sponge — shares zero code with SHA-2, providing cryptographic diversity for critical systems.

Features

✓Compute SHA3-256 hashes online — NIST's third-generation 256-bit standard on Keccak sponge
✓Real-time 256-bit hash computation with 64 hex character output
✓One-click copy, download as .txt, and uppercase/lowercase toggle
✓Shares zero code with SHA-2 — completely independent cryptographic design
✓Hash verification against known SHA3-256 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

SHA-256 Hash Calculator — Bitcoin & HTTPS Standard

The global industry standard — powers Bitcoin, HTTPS certificates, and digital signatures worldwide. 256-bit output, 128-bit security. The most trusted SHA-2 variant by far.

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.

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.