Protobuf Decode

Decode a protobuf message to JSON using your own schema. Paste the .proto in one box and the message bytes (hex) in the other, then pick which message type the bytes are — a .proto defines several, and the decoder has to know. Protobuf bytes do not carry field names or the full message shape by themselves, so the schema is what turns field numbers back into readable JSON. Both the schema and the data stay in your browser.