SHA3-256 at a glance
| Output | 256 bits (64 hex characters) |
|---|---|
| Rate / capacity | 1088 / 512 bits |
| Collision resistance | 128 bits |
| Preimage resistance | 256 bits |
| Standard | NIST FIPS 202 (2015) |
Where it is used
Used inside ML-KEM (FIPS 203), the new post-quantum key-encapsulation standard, and anywhere a protocol asks for "SHA3-256" by name. If you need Ethereum compatibility, you want Keccak-256 instead.
Known answers
SHA3-256:
| Input | Digest (hex) |
|---|---|
| "" (empty) | a7ffc6f8bf1ed76651c14756a061d662f580ff4de43b49fa82d80a4b80f8434a |
| "abc" | 3a985da74fe225b2045c172d6bd390bd855f086e3e9d525b46bfe24511431532 |
| "hello world" | 644bcc7e564373040999aac89e7622f3ca71fba1d972fd94a31c3bfbf24e3938 |
In code
import hashlib
hashlib.sha3_256(b"hello world").hexdigest()More languages: SHA-3 code examples. Other calculators: SHA3-512 · Keccak-256 · SHAKE256.
Frequently asked
Is the SHA3-256 calculator private?
Yes. The hash is computed in your browser; nothing you type or drop is uploaded.
What is the SHA3-256 of an empty string?
SHA3-256 of "" = a7ffc6f8bf1ed76651c14756a061d662f580ff4de43b49fa82d80a4b80f8434a
Own sha3.si
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