https://www.authgear.com/tools/jwk-generator/?ref=tiny-helpers
JWK Generator — PEM to JWK, JWK to PEM & JWKS Generator | Authgear
PEM → JWK, JWK → PEM, or generate keys and download JWKS. Choose kid, alg, and use (sig/enc). Browser-only, no signup.
jwk generatorpemauthgear