SHA3-256 Hash Generator
Compute SHA3-256 hashes locally in your browser — no data leaves your device.
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SHA3-256 is a member of the SHA-3 family standardized by NIST in FIPS 202 (2015). It produces a 256-bit (64 hex character) digest using the Keccak sponge construction — a fundamentally different design from SHA-1 and SHA-2's Merkle–Damgård structure. The sponge absorbs input data and squeezes out the digest, with a 1600-bit internal state and 24 rounds of the Keccak-f permutation.
Unlike SHA-256, SHA3-256 is immune to length-extension attacks — a structural weakness in all Merkle–Damgård hashes. SHA3-256 is used in Ethereum signing, post-quantum cryptographic protocols, and anywhere a 256-bit hash without SHA-2's structural properties is required.