SHA3-512 hash generator
SHA3-512 is the strongest fixed-length function in the SHA-3 family, returning a 512-bit digest written as 128 hex characters. Its 1024-bit capacity gives it a very large security margin. This SHA3-512 generator calculates the digest of text or files without sending them anywhere.
Example
Input:
The quick brown fox jumps over the lazy dogSHA3-512 hash:
01dedd5de4ef14642445ba5f5b97c15e47b9ad931326e4b0727cd94cefc44fff23f07bf543139939b49128caf436dc1bdee54fcb24023a08d9403f9b4bf0d450SHA-3 vs SHA-2
SHA-3 is not an upgrade of SHA-2 but a completely different design. After the attacks on MD5 and SHA-1, NIST ran an open competition (2007–2012) to obtain a backup hash based on different mathematics. The winner, Keccak by Bertoni, Daemen, Peeters and Van Assche, became FIPS 202 in 2015. Instead of the Merkle–Damgård structure, it uses a sponge: input is absorbed into a 1600-bit state and output is squeezed out, with 24 rounds of the Keccak-f permutation in between. SHA-2 remains secure, so SHA3-512 is chosen mainly for diversity, length-extension resistance or where a specification requires it.
SHA3-512 at a glance
| Property | Value |
|---|---|
| Digest size | 512 bits (64 bytes, 128 hex characters) |
| Rate / capacity | 576 / 1024 bits |
| Collision resistance | About 256 bits |
| Preimage resistance | About 512 bits |
| Length extension | Not vulnerable |
Performance trade-off
With a rate of only 72 bytes per permutation, SHA3-512 is the slowest SHA-3 variant — roughly half the speed of SHA3-256 in software. For most applications 256-bit output is plenty; SHA3-512 is chosen where maximum margin matters more than throughput, or where a specification requires a 512-bit digest.
Typical uses
- Long-lived signatures and archival integrity where the hash must stay strong for decades.
- Key derivation and protocols that need 512 bits of output from a single call.
- Security profiles requiring 256-bit collision resistance with SHA-3’s design.
If you need more than 512 bits, or a variable length, look at the extendable-output functions SHAKE-256 and BLAKE3. For the SHA-2 equivalent, see SHA-512.
In code
Python: hashlib.sha3_512(data).hexdigest(). Node.js: crypto.createHash('sha3-512'). OpenSSL: openssl dgst -sha3-512 file. Text in this tool is UTF-8 encoded, so matching bytes give matching hashes. SHA3-512 is a fast hash, not a password hash — use Argon2id or bcrypt for passwords.
Verifying a file against a SHA3-512 checksum
Some software releases and archives publish SHA3-512 checksums next to the download. To check one, switch the source to File, choose the downloaded file and paste the published value into Compare with an expected hash. A match means the file is byte-for-byte what the publisher hashed; any difference, even a single changed bit, produces a completely different digest.
An implementation check is just as quick: the SHA3-512 of an empty input starts with a69f73cca23a9ac5…. Leave the text box empty and compare the start of the result with that value.