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HTML to Protobuf Converter

Transform HTML into Protocol Buffers schema definition

HTML Input

Convert HTML to other formats

HTML to ActionScriptHTML to ASCIIHTML to AsciiDocHTML to ASPHTML to AvroHTML to BBCodeHTML to CSVHTML to DAX

Protobuf Schema

Convert other formats to Protobuf

CSV to ProtobufExcel to ProtobufJSON to ProtobufLaTeX to ProtobufMarkdown to ProtobufMediaWiki to ProtobufMySQL to ProtobufSQL to Protobuf

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About HTML to Protobuf Converter

This HTML to Protobuf converter generates Protocol Buffers (Protobuf) schema definitions directly from your HTML structure. It analyzes the DOM tree of your HTML document and outputs a .proto file that you can use for efficient, strongly typed data serialization and cross‑language communication.

Key Features of the HTML to Protobuf Tool

  • Automatic Protobuf schema generation: Convert HTML documents into valid proto3 message definitions.
  • DOM‑based structure mapping: Map HTML elements, attributes, and text content into nested Protobuf messages.
  • Optional metadata fields: Include document title, charset, and language as part of the schema.
  • Repeated fields for collections: Use repeated fields to represent lists of elements in your HTML body.
  • Attribute maps: Store HTML attributes such as id, class, and data-* attributes in a Protobuf map<string, string>.
  • Proto3 syntax: Generate modern, forward‑compatible schemas using the syntax = "proto3" standard.
  • Inline example structure: Embed a commented JSON‑like example showing how your data might look when serialized.

How to Convert HTML to Protobuf Schema

  1. Paste or upload HTML: Paste HTML code into the editor or upload an .html file exported from your app or website.
  2. Set the message name: Choose a descriptive Protobuf message name such as HtmlDocument or PageLayout.
  3. Configure options: Decide whether to include metadata fields and whether to treat body elements as repeated fields.
  4. Review the generated .proto: The tool automatically updates the Protobuf schema as you edit the HTML or options.
  5. Copy or download: Copy the schema to your clipboard or download it as a .proto file ready for compilation.

Generated Protobuf Schema Structure

  • Main document message: Contains optional metadata (title, charset, language) and a body field referencing one or more Element messages.
  • Element message: Represents HTML elements with fields for tag_name, attributes, text_content, and nested children.
  • Attribute message: Optional helper message containing name/value pairs for attributes.
  • Nested DOM representation: The schema mirrors your HTML tree using recursive element children.

Example: HTML to Protobuf Schema

Given a simple HTML snippet like this:

<body>
  <h1 id="main-title" class="header">Welcome</h1>
  <p class="intro">This is an example page.</p>
</body>

The generated Protobuf schema (simplified) might look like:

syntax = "proto3";

package html;

message HtmlDocument {
  string title = 1;
  string charset = 2;
  string language = 3;
  repeated Element body = 4;
}

message Element {
  string tag_name = 1;
  map<string, string> attributes = 2;
  string text_content = 3;
  repeated Element children = 4;
}

Why Convert HTML to Protobuf?

  • Efficient serialization: Protobuf encodes your HTML‑derived data in a compact binary format, smaller and faster than JSON or XML.
  • Strong typing: A defined Protobuf schema ensures consistent structure across services and languages.
  • Cross‑language compatibility: Use the same HTML‑derived schema in Java, C++, Go, Python, Node.js, and more.
  • Schema evolution: Add or deprecate fields over time while maintaining backward compatibility via field numbers.
  • Unified data model: Represent HTML layouts or content as structured data for microservices, APIs, and data pipelines.

Using the Generated .proto File

Once you download the .proto file from the HTML to Protobuf converter, you can:

  • Compile the schema: Run protoc with language‑specific plugins to generate classes or structs.
  • Serialize HTML‑derived data: Build objects that follow the generated schema and serialize them to binary Protobuf.
  • Deserialize in other services: Parse the binary data in microservices, backend systems, or mobile apps.
  • Validate data: Ensure your data always conforms to the schema before sending or storing it.

Compilation Examples

# Compile for Python
protoc --python_out=. htmldocument.proto

# Compile for Java
protoc --java_out=. htmldocument.proto

# Compile for Go
protoc --go_out=. htmldocument.proto

Best Practices for HTML to Protobuf Conversion

  • Choose meaningful message names: Name your root message after the domain concept, e.g., ArticlePage, LandingPage, or DocumentationPage.
  • Keep HTML clean: Well‑structured, semantic HTML produces clearer schemas and easier‑to‑understand data models.
  • Use metadata when useful: Include title, language, and charset when you care about SEO or localization.
  • Review and refine: Treat the generated schema as a starting point—edit the .proto file to match your exact requirements.
  • Comment your fields: Add explanatory comments in the .proto file for future maintainers.

HTML to Protobuf Converter FAQ

What is Protocol Buffers (Protobuf)?

Protocol Buffers is a language‑neutral, platform‑neutral mechanism developed by Google for serializing structured data. It uses a .proto schema to define messages and field types, then encodes data into a compact binary format.

Why would I convert HTML to Protobuf?

Converting HTML to Protobuf is useful when you want to treat HTML documents as structured data in services, APIs, or data pipelines. The generated schema gives you a consistent way to serialize and exchange content derived from HTML.

Can I customize the generated Protobuf schema?

Yes. The HTML to Protobuf converter creates a starting schema that you are free to edit. You can rename messages, adjust field types, add additional messages, or reorganize the structure.

Does this tool support proto2?

The converter generates proto3 syntax by default, which is recommended for most modern projects. If you need proto2, you can manually adapt the schema after generation.

Is my HTML or generated schema sent to a server?

No. All HTML parsing and Protobuf schema generation runs locally in your browser, and your data is not uploaded or stored on any external server.

Privacy & Security

All HTML to Protobuf conversions happen entirely in your browser. Your HTML, generated .proto files, and any derived data stay on your device, keeping your content private and secure.