Skip to main content

XML Formatter

Pretty-print and validate XML with proper nesting and indentation.

Indent:
Input (XML)
Output (Formatted)

Paste XML to see formatted output…

Features

Pretty-print

Format XML with configurable 2 or 4 space indentation for clean, readable output.

XML Declaration

Optionally include the standard XML declaration header with encoding information.

Syntax Validation

Real-time validation using the browser's built-in XML parser with error location reporting.

Proper Nesting

Correctly handles self-closing tags, text nodes, comments, and complex nested structures.

All processing happens locally in your browser. No data is sent to any server.

How Xml Formatter Works in Your Browser

The ToolsForgess XML formatter transforms minified or malformed XML into human-readable, properly indented structures with syntax error detection. Paste your XML string, select an indentation depth, and receive a formatted, syntax-highlighted view that exposes missing closing tags, unclosed elements, and attribute errors. The formatter parses XML using the browser's native DOMParser API and reconstructs the document with consistent indentation — all without transmitting any data to a server. Error reporting includes line and column numbers for precise issue identification. This tool is essential for developers debugging SOAP responses, validating XML configuration files, formatting XSLT stylesheets, and preparing XML documents for version control commits where readability matters.

Key Features

  • Detect XML syntax errors with precise line and column numbers. Identify missing closing tags, unclosed elements, and malformed attributes before they cause processing failures.
  • Choose between two, four, or eight spaces, or tab-based indentation to match your coding standards. The formatter applies consistent depth across the entire document.
  • Syntax-highlighted output with element, attribute, and text color differentiation makes XML structure immediately visible. Navigate complex documents with visual clarity.
  • All parsing and formatting occur entirely within the browser using DOMParser. No XML content is transmitted to any server.

Frequently Asked Questions

Does the formatter validate XML against a schema?
The formatter validates XML syntax — correct tag nesting, proper attribute quoting, well-formed structure. It does not perform DTD or XML Schema validation. Use the XML Validator tool for schema-level checks.
Can I format XML from an API response?
Paste the XML response body from your API client or browser network tab into the input field. The formatter processes raw XML text regardless of its source.
What is the maximum XML size supported?
The formatter handles multi-megabyte XML documents efficiently. Very large files may experience brief processing delays depending on document complexity and available browser memory.
Is my XML data stored during formatting?
No. All parsing and formatting occur entirely within the browser. Your XML content is not transmitted to any server.

All data processing for Xml Formatter runs 100% locally in your browser using client-side JavaScript. No data is uploaded to any server.

Technical Specification

XML Formatting Engine & Structural Pretty-Printing

Overview

The ToolsForges XML formatter transforms minified, malformed, or inconsistently indented XML documents into human-readable, properly structured markup with configurable indentation and line breaks. Paste your XML string, select an indentation depth, and receive a clean, formatted output that exposes structural errors, mismatched tags, and malformed entities.

Feature Specifications

  • Configurable IndentationChoose between two, four, or eight spaces, or tab-based indentation to match your project's coding style guide. The formatter applies consistent indentation throughout the entire document.
  • Syntax Error DetectionParse and validate XML structure in real time, reporting mismatched tags, unclosed elements, malformed entities, and attribute syntax errors with precise location indicators.
  • Attribute FormattingFormat XML attributes with consistent spacing, quote style, and line-wrapping for long attribute lists, improving readability of complex element declarations.
  • Copy and Download ExportCopy the formatted XML to your clipboard or download it as a file with a single click, ready for use in configuration files, data feeds, or document processing pipelines.

Architecture

The formatter uses React useState for input management and the browser's DOMParser API for syntax validation. The custom serializer traverses the parsed DOM tree, applying indentation rules and whitespace formatting to produce clean output.

Frequently Asked Questions

Does the formatter handle XML namespaces?

Yes. The formatter preserves XML namespace declarations and prefixed elements, maintaining correct namespace binding throughout the formatted output.

Can I format SOAP or XSD documents?

Yes. The formatter processes any well-formed XML document, including SOAP envelopes, XSD schema definitions, and other specialized XML vocabularies.

What is the maximum XML size supported?

The formatter handles documents up to several megabytes efficiently. Very large XML files may experience brief processing delays depending on document complexity.

Is my XML data stored?

No. All XML content is processed in-memory within your browser. No document data, configuration files, or markup content is transmitted to external servers.