Tablizer

Convert XML to Protobuf Schema Online

Paste an XML table below, edit it if you need to, and get Protobuf Schema back. The conversion runs in your browser, so nothing is uploaded, there is no size limit and there is no signup.

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Nothing here is uploaded. The parsing happens on this page.
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The output will appear here once there is a table to convert.

What XML is

XML marks up data with nested named tags and optional attributes. It is verbose, strict about being well-formed, and can carry a schema that says what shape a document must have.

Enterprise integrations, government data feeds, RSS, SOAP services and older document formats.

What Protobuf Schema is

A proto3 message definition with numbered fields.

gRPC services and anything using Protocol Buffers.

What changes when you convert XML to Protobuf Schema

The first repeating element is treated as the rows. Attributes are read alongside child elements and prefixed so they do not collide with a same-named tag. Nesting one level deep becomes dotted column names; deeper structures are kept as text.

Field numbers are assigned in column order starting at one. Types are inferred from the values.

What carries over from XML to Protobuf Schema

Protocol Buffers can express everything XML holds about a table, so this conversion is about shape rather than loss.

Protocol Buffers wants a type for each column, and XML does not record one, so each column is typed from what its values look like. A column of digits that should stay text - a zip code, a phone number, a leading-zero id - is the usual thing to check afterwards.

A worked example

Three rows of staff data, with an identifier that has a leading zero, a value containing a comma, a value containing quotes and one blank cell. Those are the four places formats disagree, so they are the four places to look.

XML in
<?xml version="1.0" encoding="UTF-8"?>
<staff>
  <person id="007">
    <name>Halima Yusuf</name>
    <role>Analyst, data</role>
    <started>2024-03-15</started>
    <hours>38.5</hours>
  </person>
  <person id="012">
    <name>Jonah "Jo" Pryce</name>
    <role>Engineer</role>
    <started>2025-11-02</started>
    <hours></hours>
  </person>
  <person id="104">
    <name>Wei Chen</name>
    <role>Manager</role>
    <started>2023-06-30</started>
    <hours>40</hours>
  </person>
</staff>
Protobuf Schema out
syntax = "proto3";

message staff {
  int64 id = 1;
  string name = 2;
  string role = 3;
  string started = 4;
  double hours = 5;
}

Questions

How do I convert XML to Protobuf Schema?

Paste your XML into the box above or drop the file onto it. Check the table in the grid, then copy or download the Protobuf Schema from the output panel. It takes one step and the data never leaves your browser.

Is there a limit on file size?

No. The work happens on your own machine, so the limit is your machine's memory rather than an upload cap. A file with tens of thousands of rows converts in a second or two.

Is my data uploaded anywhere?

No. The parsing and generating are done by JavaScript running on this page. You can watch the network tab while you convert and see that nothing is sent.

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