HKDF Key Derivation Tool

Enter input keying material, salt, info, and output length using text or hexadecimal bytes and inspect exact output bytes.

Hash

Input format

Output bytes

Input keying material

Salt

Info

Derived key (hex)

Ready

All cryptographic operations run locally in your browser. Keep private keys secret and use production key-management practices for real systems.

How to use this HKDF Key Derivation Tool

Derive key material with HKDF using SHA-256, SHA-384, or SHA-512. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.