Public Key Fingerprint Calculator

Hash the exact DER bytes behind a PUBLIC KEY PEM and view colon-hex, Base64, and Base64URL fingerprints locally.

Public key (SPKI / PUBLIC KEY PEM)

Hash

Colon-separated hex

Ready

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

Fingerprint format cross-check

Hash the same public-key text with SHA-256 and show hex, colon-separated hex and base64 forms for copy/paste verification.

—UTF-8 bytes hashed

SHA-256Digest algorithm

Ready.

For protocol-specific fingerprints, confirm whether the protocol hashes PEM text, DER bytes, or another canonical key encoding.

Browser-local cryptographic utilities

preserves the established Web Crypto workflows while connecting token, key, KDF, encryption/signature, fingerprint and verification jobs. Inputs stay in your browser unless the page clearly states that a network request is required.

Protocol boundary

Correct primitive output does not certify a complete protocol, key-management system, parameter choice, endpoint, or production deployment. Match the source system exactly and use established application/security libraries for production authentication and storage.