Protobuf Encoder / Decoder

Define a .proto schema, then encode JSON to Protobuf binary or decode binary back to JSON. Everything runs in your browser — nothing is sent to a server.

What is Protocol Buffers?

Protocol Buffers (Protobuf) is Google’s language-neutral, platform-neutral serialisation format. It is smaller, faster, and more structured than JSON — commonly used in gRPC services, inter-service communication, and high-throughput data pipelines.

How to Use This Tool

1. Paste your .proto schema — Define your message types with field numbers and types.
2. Encode — Provide JSON matching your schema and get the Protobuf binary output (hex-encoded).
3. Decode — Paste Protobuf binary data and get the JSON representation back.

When Protobuf Beats JSON

• Size — Protobuf payloads are typically 3-10x smaller than equivalent JSON.
• Speed — Serialisation and deserialisation are significantly faster.
• Schema enforcement — The .proto file acts as a contract between services, catching breaking changes at compile time.

Privacy

Uses protobuf.js running entirely in your browser. Your schemas and data never leave your machine.