# SHA3-256 Generator

Compute the SHA3-256 hash of any text with the Keccak-based SHA-3 standard from FIPS 202. The tool encodes your input as UTF-8 and returns the 256-bit digest as 64 hex characters or as Base64. It is useful for developers who need SHA-3 digests for protocols, test fixtures and integrity checks, or who want to compare results with another SHA-3 library.

## Frequently asked questions

### What is SHA3-256?

SHA3-256 is a hash function from the SHA-3 standard, FIPS 202, built on the Keccak sponge construction. It produces a 256-bit digest, shown as 64 hexadecimal characters. Its internal design is completely different from SHA-2.

### Is SHA3-256 the same as Keccak-256 used by Ethereum?

No. Ethereum uses the original Keccak-256 submission, which pads its input differently from the final SHA-3 standard. The two give different digests for the same text. This tool computes the standardized SHA3-256 from FIPS 202.

### What are the SHA3-256 test vectors?

The empty string hashes to a7ffc6f8bf1ed76651c14756a061d662f580ff4de43b49fa82d80a4b80f8434a. The text abc hashes to 3a985da74fe225b2045c172d6bd390bd855f086e3e9d525b46bfe24511431532. Both match the NIST examples.

### Why choose SHA-3 over SHA-256?

SHA-3 offers a backup if a weakness is ever found in SHA-2, because the two designs share nothing. It is also immune to length extension attacks. SHA-256 remains secure and is more widely supported, so pick SHA-3 when a specification calls for it.

### How is my input processed?

Your text is encoded as UTF-8 and hashed byte for byte. Every space and line break counts. The computation runs in WebAssembly on the server, and the input is not stored.

### What is the difference between the hex and Base64 outputs?

Both encode the same 32-byte digest. Hex uses 64 lowercase characters, while Base64 needs 44 characters including one padding sign. Use the format your code or documentation expects.

### Can SHA3-256 be reversed?

No. SHA3-256 is a one-way function, so the original text cannot be computed from the digest. Short or common inputs can still be guessed by trying candidates, so never treat a hash of a guessable value as secret.

### Is SHA3-256 suitable for passwords?

Not on its own. It is fast, so attackers can test many guesses per second. Use a password hashing function such as Argon2, bcrypt or scrypt instead.

### How long may the text be?

The tool accepts up to 5 MiB of text per request. Longer data or binary files are better hashed locally, for example with openssl dgst -sha3-256.

### Does SHA3-256 give the same result everywhere?

Yes. Any correct implementation returns the same digest for the same bytes. If two tools disagree, the cause is almost always a different text encoding, a trailing newline or the Keccak variant mix-up described above.

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