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SHA3 Hash Generator

Enter text and pick a SHA3 variant to generate its hash digest.

How it is calculated

The tool hashes the exact bytes of the text you enter with SHA-3 and prints the digest as lower-case hexadecimal. Four variants are offered: sha3-224, sha3-256, sha3-384 and sha3-512. The number is the digest size in bits, so the hex string has size ÷ 4 characters (56, 64, 96 or 128) and the tool also reports the size in bytes (size ÷ 8: 28, 32, 48 or 64). An empty text gives no result. Any unknown variant name falls back silently to sha3-256. The text is not trimmed or normalized, so spaces, line breaks and capitalization all change the digest, and the text is hashed as UTF-8 bytes. A hash cannot be reversed back to the text.

Worked example

Enter the text abc and choose sha3-256. The tool hashes the three bytes 61 62 63 and returns a 256-bit digest, which is 256 ÷ 4 = 64 hex characters or 32 bytes: 3a985da74fe225b2045c172d6bd390bd855f086e3e9d525b46bfe24511431532. Choosing sha3-224 for the same text gives the shorter, 56-character e642824c3f8cf24ad09234ee7d3c766fc9a3a5168d0c94ad73b46fdf, so the variant matters.

Try this example →

Common mistakes

  • Adding a trailing space or line break when copying text. abc and abc (with a space) give completely different digests, so check for invisible characters.
  • Comparing a SHA3-256 digest with a SHA-256 digest. They are different algorithms and give different values for the same text, even though both are 64 hex characters long.
  • Choosing the variant by name memory. Entering an unsupported name does not warn you but returns SHA3-256, so verify the variant in the result.
  • Using a plain hash to store passwords. SHA-3 is fast and unsalted here, so it is a poor choice for protecting passwords; a salted, slow password hash is what is needed.
  • Expecting to hash a file by pasting its name. The tool hashes the text typed in, not the contents of a file with that name.

About this calculator

SHA-3 is the newest member of the Secure Hash Algorithm family, standardized by NIST in 2015 (FIPS 202) and built on the Keccak sponge construction — a fundamentally different internal design from SHA-1 and SHA-2, chosen partly as insurance in case a weakness were ever found in the older SHA-2 family. It comes in four output sizes — 224, 256, 384 and 512 bits — each producing a fixed-length hexadecimal digest no matter how long the input text is, and any change to the input, however small, produces a completely different digest.

Because the transformation only runs one way, SHA-3 hashes are used to verify that a file or message hasn’t been altered, to fingerprint data for deduplication, and as a building block inside digital signatures and other cryptographic protocols. Software developers, security engineers and cryptography students use a hash generator like this one to compute a SHA-3 digest of arbitrary text and check it against a known value.

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Comments (1)

  • Editorial team

    SHA-3 is the standardised Keccak family, but Ethereum-style Keccak-256 uses different padding and gives a different digest, so do not compare the two. Here hello hashed with sha3-256 returns 3338be69 at the start and runs 32 bytes in total. Also avoid plain hashes for storing passwords; use a slow salted scheme instead. Which system or library are you checking your digests against?

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