SHA3-256 File Hash
Calculate a SHA3-256 hash from a local file or file URL. Local files are processed in your browser. Read more
What is SHA3-256?
SHA3-256 is the fixed 256-bit SHA-3 hash standardized in NIST FIPS 202. This tool reads raw file bytes. SHA3-256 differs from SHA-256 and from the original Keccak-256 File Hash, so check the exact name used by the publisher.
How to use this file hash calculator
Choose a local file or enter a URL and select the output encoding. Local files are processed in your browser without upload; a remote server must permit CORS for URL hashing.
Result example
A file containing exactly abc produces 3a985da74fe225b2045c172d6bd390bd855f086e3e9d525b46bfe24511431532 in Hex. Renaming an otherwise unchanged file does not affect the digest.
Important limitations
Matching an unkeyed digest can detect a byte-level change, but it does not authenticate the download. Obtain the expected SHA3-256 value through a trusted source.
Frequently asked questions
Why does my result differ from another tool?
Confirm both tools use SHA3-256—not SHA-256 or Keccak-256—and process identical raw file bytes.
Can I use the result to verify a download?
Yes, when a trusted publisher supplies a SHA3-256 digest independently. For encoded text, use the SHA3-256 calculator.
