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How to Convert C# to Protobuf - Step by Step Guide

Step 1

Input Your C# Class Definitions

Start by entering your C# class definitions that need to be converted to Protocol Buffer schema:

•
Paste C# code: Copy class definitions from your .NET applications or POCOs
•
Upload C# file: Upload .cs files containing class definitions
•
Use sample data: Click "Sample" to load example C# classes and see the conversion

Example: C# Class Input

Here's a typical C# POCO ready for protobuf conversion:

namespace Example
{
    public class User
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public string Email { get; set; }
        public List<string> Roles { get; set; }
        public bool Active { get; set; }
        public UserProfile Profile { get; set; }
    }

    public class UserProfile
    {
        public string Department { get; set; }
        public int ExperienceYears { get; set; }
        public List<string> Skills { get; set; }
    }
}
Step 2

Automatic Schema Generation

The tool automatically analyzes your C# classes and generates a corresponding Protocol Buffer schema:

•
Type mapping: Automatically converts C# types to protobuf types (string, int, bool, etc.)
•
Field numbering: Assigns sequential field numbers for protobuf schema
•
Nested structures: Handles nested classes and converts them to nested messages
•
Collection detection: Automatically adds "repeated" keyword for List, IList, and other collections

Example: Generated Protobuf Schema

The same C# classes, now converted to protobuf schema:

syntax = "proto3";

package example;

message User {
  int32 id = 1;
  string name = 2;
  string email = 3;
  repeated string roles = 4;
  bool active = 5;
  UserProfile profile = 6;
}

message UserProfile {
  string department = 1;
  int32 experience_years = 2;
  repeated string skills = 3;
}
Step 3

Copy or Download Protobuf Schema

Get your generated protobuf schema ready for use! Multiple export options available:

•
Copy to clipboard: One-click copying for immediate use in your projects
•
Download as .proto: Save as a .proto file for your gRPC services
•
Integration ready: Perfect for microservices, API definitions, and cross-language communication

Example: Generated Protobuf Schema

The same C# classes, now converted to protobuf schema:

syntax = "proto3";

package example;

message User {
  int32 id = 1;
  string name = 2;
  string email = 3;
  repeated string roles = 4;
  bool active = 5;
  UserProfile profile = 6;
}

message UserProfile {
  string department = 1;
  int32 experience_years = 2;
  repeated string skills = 3;
}

Frequently Asked Questions

Why convert C# classes to Protobuf?

Converting C# classes to Protobuf enables efficient serialization, cross-language compatibility, and is essential for building gRPC services and microservices architectures with .NET.

What C# types are supported?

This tool supports all basic C# types (string, int, long, float, double, bool), collections like List and IList (converted to repeated fields), and nested classes (converted to nested messages).

Can I convert multiple C# classes at once?

Yes! The tool automatically detects and converts all class definitions in your input, including nested classes, and generates corresponding protobuf messages.

How are C# property names converted?

C# property names (typically PascalCase) are automatically converted to snake_case following protobuf naming conventions. For example, "ExperienceYears" becomes "experience_years".

Is this C# to Protobuf converter completely free?

Yes, completely free with no file size limits, no registration required, and unlimited usage. All conversion features are available at no cost.