JWK Thumbprint Calculator

Canonicalize the required members for RSA, EC, OKP, or oct JWKs and return the Base64URL SHA-256 thumbprint.

JWK JSON

Canonical required-member JSONSHA-256 Base64URL thumbprint

ReadyRFC 7638 thumbprints hash the required members in a defined lexicographic member order, not the original pasted JSON serialization.

JWT contents are untrusted until signature verification and application-specific claim validation succeed. These browser-local tools do not contact an issuer, fetch keys, or validate authorization policy.

How to use this JWK Thumbprint Calculator

Calculate an RFC 7638 SHA-256 JWK thumbprint locally. 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.