Keccak-256 Hash Generator
Use this tool to generate Keccak-256 hashes directly in your browser. Keccak-256 is the original algorithm that preceded the SHA-3 standard. It provides a 256-bit (64 hex characters) digest and is frequently used in cryptographic protocols like Ethereum and other decentralized networks.
Everything runs entirely on your device. Your data is never uploaded to a server, making it safe for hashing local variables and development strings.
Padding differences from SHA-3
The most common source of hash mismatch is confusing Keccak-256 with SHA3-256. While SHA-3 is derived from Keccak, the final standard introduced different padding rules.
A string hashed with Keccak-256 will yield a completely different digest than the same string hashed with SHA3-256. Always verify which variant your underlying protocol expects.
Batch processing
If you paste multiple lines of text, the tool can hash each line individually. Check “Batch by newline” to produce a list of digests corresponding to your input list.
You can also use “Trim lines” to automatically remove leading and trailing whitespace before the hash is calculated, preventing hidden characters from corrupting the result.
Character encodings
Cryptographic hashes are sensitive to exact byte sequences. A single space, a change in capitalization, or different Unicode representations will drastically alter the 64-character output.
Enable “Normalize Unicode” to ensure visually identical characters (like accented letters) are converted to a consistent internal representation before hashing.