KMAC256 File Hash Calculator
Compute KMAC256 (256-bit security Keccak MAC) hash of any file in your browser. NIST SP 800-185. Enter key, output length, and optional customization. No upload required.
File Input
Drag and drop a file here, or click to select. Processed locally — never uploaded.
Output
Settings
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About KMAC256 File Hash Calculator
KMAC256 file hashing provides the highest security level in the NIST SP 800-185 MAC family. With 256-bit security, KMAC256 is appropriate for applications requiring post-quantum resistance or long-term file authentication where the MAC tag must remain unforgeable for decades.