Online XML Formatter & Validator

Clean, validate, and pretty-print messy XML code, minify payloads, or convert XML to JSON. 100% private in-browser processing with zero server calls.

At a glance

XML Formatter & Validator is a free browser tool that formats, validates, and minifies XML data with syntax error detection and tree indentation. It automatically detects malformed XML syntax and reports exact error descriptions with line and column references. Processing happens entirely on your device — nothing is uploaded and no account is required.

Data Suite: XML Formatter CSV to JSON JSON to CSV JSON Formatter SQL Formatter

100% In-Browser XML Engine

XML documents, RSS feeds, and configuration files are processed entirely in browser memory. Zero payload data is transmitted to external servers.

Zero Server Telemetry
Elements Count 0
Attributes 0
Max Depth 0
Document Size 0 B

Raw XML Input

0 chars

Formatted XML Output

Why Use This XML Formatter & Validator?

Precise XML Validation: Automatically detects malformed XML syntax and reports exact error descriptions with line and column references.
Configurable Pretty Printing: Format unorganized XML, RSS feeds, and POM files with 2 spaces, 4 spaces, or Tab indentation.
High-Efficiency Minification: Compress XML files by stripping whitespace between tags to minimize network payload transfer sizes.
XML to JSON Conversion: Instantly convert XML elements and attribute trees into valid structured JSON.
100% Client-Side Privacy: All parsing and transformations occur purely in your browser memory with zero external requests.

How to Use XML Formatter & Validator

1

Paste or Upload XML

Enter raw XML directly, upload an XML file, or select a sample preset.

2

Select Format, Minify, or JSON

Choose whether to pretty print, compress whitespace, or convert to JSON.

3

Copy or Download

Inspect document tree metrics and copy or download the resulting document.

Worked example: Minified Catalog to Indented Tree

The engine validates with DOMParser (application/xml), then tokenizes tags and re-indents with 2-space depth tracking, plus minify and XML-to-JSON modes.

Minified XML Input Source 
<catalog><book id="1"><title>Clean Code</title><price>42.50</price></book></catalog>
Pretty-Printed XML Output Processed 
<catalog>
  <book id="1">
    <title>Clean Code</title>
    <price>42.50</price>
  </book>
</catalog>

Technical Specifications & Engine Details

Technical specifications and engine details for XML Formatter & Validator
Specification Details
Supported Formats XML, TEXT → XML, JSON, TEXT
Execution Mode 100% Client-Side In-Browser (client)
Browser Requirements Requires modern web browser with ECMAScript 6+ and standard DOM Web APIs.
Performance Constraints Client browser memory limit (typically 1–2 GB RAM); processing speed depends on local device CPU.
Maintained by Pragyan Pahadi

100% Client-Side Privacy Guarantee

All XML document processing and transformations run locally in your browser memory. Zero XML data is transmitted to external servers.

Frequently Asked Questions

How does the XML validation work?
Our validator uses browser native DOMParser to parse the XML hierarchy and inspect for parse errors, pinpointing the exact syntax error.
Does the formatter support namespaces and CDATA blocks?
Yes. XML declarations, XML namespaces, CDATA sections, and comments are fully preserved during formatting.
Can I convert XML to JSON with this tool?
Yes. Switch to the XML to JSON mode to convert nested XML elements and attributes into a structured JSON representation.
Is my XML payload confidential?
Yes, 100%. All parsing and transformations happen entirely inside your local browser memory without server transmission.

Methodology

Rankings and recommendations here are never paid for.

Last updated .

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