JSON ↔ Protobuf Converter

.proto Schema

JSON Data

Message Type:

Output

Free Online Protobuf Converter

Convert between JSON and Protocol Buffers format. Provide a .proto schema definition and your data to encode JSON to Protobuf binary (displayed as hex) or decode Protobuf binary back to JSON. Uses the protobuf.js library.

Note: This tool parses .proto files dynamically in the browser. Complex schemas with imports or advanced features may not be fully supported.