SHA3-256 Hash Generator

Generate a SHA3-256 hash from any text string to match Ethereum, Keccak-family, and NIST FIPS 202 checksums.

Input

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Output

Output will appear here...

What is SHA3-256 Hash Generator

Last reviewed: April 18, 2026

SHA-3 is the latest member of the Secure Hash Algorithm family, based on the Keccak sponge construction and designed as a backup to SHA-2.

SHA3-256 Hash Generator computes a 64-character hexadecimal SHA3-256 digest from any text using the NIST FIPS 202 standard hash function.

It is useful for verifying payloads, generating deterministic identifiers, and comparing reference vectors when implementing Keccak-family primitives in a backend or smart-contract toolchain.

Why use it

Generate 256-bit fingerprints that are structurally independent of SHA-2.
Produce reproducible content hashes for audit trails and manifests.
Double-check library output while porting code between Node.js, Go, Rust, or Python implementations.
Create cache keys without relying on MD5 or SHA-1.
Verify test vectors from FIPS 202 appendix A quickly in the browser.

Features

Instant SHA3-256 output in hex
FIPS 202 compliant — matches OpenSSL -sha3-256
Client-side hashing; data never leaves the browser
Deterministic output for any UTF-8 input
Ideal for smart-contract debugging and audit logs

How to use SHA3-256 Hash Generator

Paste the text. Place the payload, message, or sample vector you want to hash into the input panel.
Read the digest. The tool returns the 64-character SHA3-256 hex digest as soon as you type.
Copy the output. Use the copy button to move the digest into your ticket, code, or manifest.

Example (before/after)

Plain text input

hello world

SHA3-256 hex digest

644bcc7e564373040999aac89e7622f3ca71fba1d972fd94a31c3bfbf24e3938

Common errors

Mixing up SHA3-256 and Keccak-256

Ethereum, Solidity, and some older libraries use the pre-FIPS Keccak-256, which has different padding.

Fix: If you are hashing Ethereum data, use a dedicated Keccak-256 generator rather than SHA3-256.

Case sensitivity surprises

"Hello" and "hello" produce entirely different digests because hashing is byte-exact.

Fix: Normalize casing and whitespace in your input before hashing if you need stable output.

Trying to reverse the digest

No tool can reverse a correctly implemented SHA3-256 hash, despite lookup tables for short inputs.

Fix: Store a reference of the original value alongside the digest if you need the plaintext later.

FAQ

Is SHA3-256 the same as the hash used in Ethereum?

No. Ethereum uses Keccak-256, which pre-dates FIPS 202 and uses different padding. Outputs differ.

How long is the output?

256 bits, shown as 64 hexadecimal characters.

Is SHA3-256 collision resistant?

Yes. It targets 128-bit collision resistance and has no known practical attacks.

Can I hash a file with this tool?

This tool hashes text. For files, use a dedicated file-checksum tool or `openssl dgst -sha3-256`.

Does my input leave my browser?

No. The hash is computed entirely on your device using client-side JavaScript.

When should I pick SHA-3 over SHA-2?

Use SHA-3 when you need algorithm diversity, must comply with FIPS 202, or want a structurally different hash function.

Related tools

Compare SHA3-256 with other SHA-3 lengths, SHA-2 digests, and keyed HMAC variants. You can also browse the full Cryptography & Hashing category for more options.

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