Generate and verify HMAC signatures locally for API requests, webhooks, signed URLs, and callback payloads. The exact bytes matter: line breaks, JSON spacing, and canonical request format must match the system that creates or checks the signature.
Use text secrets for most API dashboards, hex or Base64 when your key is provided as raw bytes, and paste an expected signature to compare without sending secrets to a server.
Related tools: Hash Generator · JWT Decoder & Verifier