SHA-3 Hash
Latest-gen SHA-3 digests in four sizes
How to Use
SHA-3 (originally Keccak) is the latest hash standard published by NIST in 2015. It uses a sponge construction completely different from SHA-2, providing a fallback should SHA-2 ever be broken. Blockchain projects like Ethereum use the Keccak family.
How to use: enter text, choose a size (224/256/384/512 bits), and the digest appears instantly with copy support. Computation is local — nothing is uploaded. Note that SHA-3 padding differs slightly from the original Keccak, so mind parameters when comparing across systems.
FAQ
Is SHA-3 more secure than SHA-2?
Neither has any known practical attack today. SHA-3's value lies in its completely different construction (sponge vs Merkle-Damgård), serving as a fallback for SHA-2. Both are fine for new projects; SHA-2 is more widely supported.
Are Keccak and SHA-3 the same thing?
SHA-3 is the standardized form of the Keccak algorithm; they differ only in padding, which changes the output for the same input. Ethereum uses the original Keccak-256, whose results differ from NIST SHA3-256.
Why doesn't WebCrypto include SHA-3?
The WebCrypto standard hasn't adopted SHA-3 yet, so this tool embeds a pure-JavaScript SHA-3 implementation. Computation still happens locally and your data is never uploaded.