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XML Validator

Perform strict XML validation checking tags balance, attributes quotation, and XML specification errors.

Interactive Online Utility

XML Validator runs 100% locally in your browser sandbox with zero network roundtrips. Load or paste your code directly into the workspace above to format, parse, validate, or generate your output instantly. 

<?xml version="1.0" encoding="UTF-8"?>
<catalog>
  <book id="bk101">
    <author>Gambardella, Matthew</author>
    <title>XML Developer's Guide</title>
  </book>
</catalog>
PRO TIP Local Client-Side Processing

Otuls runs 100% locally in your browser. Your data is processed in-memory and never transmitted over external network connections.

Technical Guide & Overview

XML Validator is a dedicated developer utility designed to streamline common workflow tasks with zero installation, instant execution, and complete data privacy.

How It Works Under the Hood

The tool leverages modern browser standards (HTML5, WebAssembly, WebGL, and modern ECMAScript) to execute complex computations directly on your local device CPU and GPU without offloading processing to third-party cloud servers.

Authoritative Specifications & Primary Standards

Official specifications, RFCs, and authoritative open-source repositories for XML Validator:

W3C Standard

Formal W3C specification defining structure, elements, and data types for XML documents.

GitHub Repository

Authoritative C XML library with native DTD and XSD validation.

Zero-Knowledge Client-Side Sandboxing

Privacy First: This tool operates completely inside your browser with zero remote logging or tracking.

Frequently Asked Questions

Q: How is XML validated?

It compiles your content using standard DOMParser in browser XML mode and outputs precise parser errors detailing the line and column of syntax errors.