# SHA3-512 Generator

Generate the SHA3-512 hash of any text using the SHA-3 standard from FIPS 202. The tool encodes the input as UTF-8 and returns the 512-bit digest as 128 hex characters or in Base64. Use it when a protocol, test suite or compliance requirement asks for SHA3-512, or when you want the largest SHA-3 security margin for integrity checks and digest comparisons.

## Frequently asked questions

### What is SHA3-512?

SHA3-512 is the 512-bit member of the SHA-3 family standardized in FIPS 202. It uses the Keccak sponge with a 1024-bit capacity. The digest is 64 bytes, shown as 128 hexadecimal characters.

### What are the SHA3-512 test vectors?

The empty string hashes to a69f73cca23a9ac5c8b567dc185a756e97c982164fe25859e0d1dcc1475c80a615b2123af1f5f94c11e3e9402c3ac558f500199d95b6d3e301758586281dcd26. The text abc hashes to b751850b1a57168a5693cd924b6b096e08f621827444f70d884f5d0240d2712e10e116e9192af3c91a7ec57647e3934057340b4cf408d5a56592f8274eec53f0. This tool reproduces both.

### Is SHA3-512 the same as SHA-512?

No. SHA-512 belongs to the SHA-2 family and SHA3-512 to SHA-3, and their designs are unrelated. They have the same output length but return different digests for the same input.

### Is SHA3-512 slower than SHA3-256?

Yes. Its larger capacity leaves a smaller rate, so it absorbs 72 bytes per permutation instead of 136. For short texts you will not notice the difference.

### How is the input encoded?

The text is hashed as UTF-8 bytes, exactly as entered. Line endings matter, so text copied from Windows files with CRLF breaks gives a different digest than the same text with LF breaks.

### Which output encoding should I pick?

Hex is the common format for checksums and logs and is 128 characters long. Base64 represents the same 64 bytes in 88 characters. Both are lossless and interchangeable.

### Is this the Keccak-512 used by some blockchains?

No. Pre-standard Keccak-512 uses different padding, so its digests differ from SHA3-512. This tool follows the final FIPS 202 standard.

### Can I use SHA3-512 for password storage?

It is not recommended. Fast hashes let attackers test guesses quickly even with a salt. Use Argon2, bcrypt or scrypt, which are designed to be slow and memory hard.

### What is the input size limit?

You can hash up to 5 MiB of text per request. Nothing you enter is stored or logged after the hash is returned.

### When does SHA3-512 make sense?

Choose it when a specification requires it or when you want a large security margin, for example in long-lived archives. For most everyday integrity checks, SHA3-256 or SHA-256 are already more than enough.

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