Generate SHA-224 digests from text or files up to 2 GiB each: 224 bits, 28 bytes, 56 hexadecimal characters.
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Pasted text up to 100 MiB, read as UTF-8, or files up to 2 GiB each.
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SHA-224 is the shortest member of the SHA-2 family standardized in NIST FIPS 180-4. It always produces 224 bits, which is 28 bytes or 56 hexadecimal characters, whatever the size of the input.
It is SHA-256's machinery with a different starting state and a shorter result. The compression function, block size and word size are all shared, so it costs the same to compute as SHA-256 while returning four fewer bytes.
That is only worth having when something else fixes the size for you: a protocol field, a legacy record layout, or a matching 112-bit security target. When nothing constrains the length, the extra four bytes of SHA-256 are free and more widely supported.
SHA-256 is the default choice and the one other systems expect. The SHA512 Hash Generator offers SHA-512/224, which lands on the same digest size through a different route and runs faster on 64-bit hardware.
Those two are not interchangeable with this one. SHA-224 and SHA-512/224 produce different digests for the same input despite the matching length, so match whichever the other system specifies.
Warning
None of these hashes store passwords. Password storage needs a slow, salted function: use Argon2id Hash Generator.
Because the output is a truncation of a larger internal state, SHA-224 does not give an attacker enough for the length-extension trick that works against full SHA-256. That is a side effect of the shorter output rather than a design goal.
Like any hash it runs one way only, and the input cannot be recovered from the digest. Fifty-six hexadecimal characters is an unusual length and a useful clue: find one in a log and SHA-224 and SHA-512/224 are your two candidates.
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