This document outlines the concept of a CSV to Protobuf converter. Building a fully functional online tool would require a backend capable of processing CSV data, generating Protobuf schema, and serializing the data. This is beyond the scope of a simple Markdown file, but we can describe the process.

Upload your CSV file or paste your CSV data into the provided input area. The converter will need to detect the delimiter (usually a comma) used in your CSV file.

This is the crucial step. You need a Protobuf schema to define the structure of your data. There are two approaches:

* Schema Inference: The converter attempts to automatically infer a Protobuf schema from your CSV data. It will analyze the data types of each column and create a corresponding Protobuf message definition. You should be able to review and adjust the inferred schema.

* Manual Schema Definition: You provide the Protobuf schema definition directly, using the Protobuf language definition (.proto file). This offers more control over data types and structure.

Once the schema is defined, the converter will process your CSV data and generate the corresponding Protobuf-encoded binary data.

The converted Protobuf data (in binary format) will be available for download. You'll likely need to use a Protobuf library in your target application to deserialize the data and access it.

CSV (Comma-Separated Values) is a simple file format used to store tabular data, such as a spreadsheet or database. Each line of the file is a data record, with each field separated by commas.

Protocol Buffers (Protobuf) is a language-neutral, platform-neutral mechanism for serializing structured data. It's often used for efficient data storage and communication between different systems. Protobuf uses a schema definition language (.proto) to describe the structure of your data. The data is then encoded in a compact binary format.