SHA3-512 Hash Generator
Turn any text into its 128-character SHA3-512 hash instantly.
How to use the SHA3-512 Hash Generator
- Type or paste your text in the box.
- The SHA3-512 hash appears as you type.
- Click Copy to grab the result.
About the SHA3-512 Hash Generator
SHA3-512 is the widest member of the SHA-3 family, producing a 512-bit digest written as 128 hexadecimal characters. It is built on Keccak, designed by Guido Bertoni, Joan Daemen, Michaël Peeters and Gilles Van Assche, which won the NIST SHA-3 competition in 2012 and was standardised as FIPS 202 in 2015.
This is the maximum-margin option: 512 bits gives 256-bit collision resistance, which is far beyond anything brute force can threaten and is the usual choice when someone wants the strongest approved digest with no further discussion. It is also the variant people pick when hashing is a tiny fraction of the total work — signing a document, deriving a long fingerprint, or archiving a checksum meant to stay meaningful for decades — so the performance cost is irrelevant. If you are hashing at volume, note that a wider digest means a larger capacity and a smaller rate inside the sponge, so SHA3-512 absorbs fewer bytes per permutation than SHA3-256 and is the slowest of the four.
SHA3-512 and SHA-512 share an output width and nothing else. SHA-512 is a SHA-2 algorithm using the Merkle–Damgård construction; SHA3-512 uses Keccak’s sponge construction, and the two produce entirely different hashes for the same input. SHA-3 was never a replacement forced by a break — SHA-2 is still secure — but a deliberately unrelated backup, so that one structural discovery could not compromise every standardised hash at once. The sponge design also means SHA3-512 is immune to the length-extension attack that affects SHA-512.
Frequently asked questions
Can I decrypt or reverse a SHA3-512 hash?
No. Hashing is one-way — the original input is not contained in the digest, so there is nothing to decrypt. Services claiming to reverse SHA-3 are just searching tables of previously hashed common words.
Is SHA3-512 the same as SHA-512?
No. They only share an output length. SHA-512 is part of the SHA-2 family and uses the Merkle–Damgård construction; SHA3-512 is Keccak-based and sponge-built, and gives a completely different hash for the same text.
Why is my SHA3-512 hash always 128 characters?
SHA3-512 always outputs 512 bits, and each hex character represents 4 bits, so every hash is exactly 128 characters however long the input is.
Is SHA3-512 overkill?
For most uses, yes — SHA3-256 already provides 128-bit collision resistance, which nothing can brute-force. SHA3-512 makes sense when a standard requires it, or when the extra margin is free because you hash rarely.
Is my text sent anywhere?
Your text is sent to our server to be hashed, because browsers cannot compute SHA-3. It is hashed and immediately discarded — never logged, never stored.