This XML formatter takes raw, minified or poorly formatted XML and converts it into a clean, properly indented document. It parses your XML input and reconstructs it with consistent indentation so the hierarchical structure becomes easy to read and understand. You can choose between different indentation styles to match your preferences. The tool also validates your XML and displays clear error messages when the input contains syntax issues. Everything runs in your browser with no server processing required.
Enter your values to see the result.
<root><item id="1"><name>Alice</name></item></root> → <root> <item id="1"> <name>Alice</name> </item> </root>
A minified XML element is expanded with 2-space indentation by default.
<?xml version="1.0"?><data><row><value>42</value></row></data> → <?xml version="1.0"?> <data> <row> <value>42</value> </row> </data>
XML declarations and processing instructions are preserved at the top.
<list><a/><b/><c/></list> → <list> <a /> <b /> <c /> </list>
Self-closing tags are properly formatted with consistent style.
XML, which stands for Extensible Markup Language, is a versatile markup language designed by the World Wide Web Consortium for storing and transporting data in a structured, human-readable format. Unlike HTML, which defines how content should be displayed in a web browser, XML defines what data means through custom tags that describe the structure and semantics of the information. This flexibility has made XML one of the most widely used data formats in enterprise computing, web services and document storage.
XML documents follow a tree structure where a single root element contains all other elements, and each element can have child elements, attributes and text content. The strict syntax rules of XML — including mandatory closing tags, case-sensitive element names, properly quoted attributes and well-formed nesting — ensure that any conforming XML parser can read and process any valid XML document consistently. This reliability is why XML remains the backbone of many critical data exchange standards including SOAP web services, RSS feeds, SVG graphics, Microsoft Office file formats and countless industry-specific data schemas.
This XML formatter uses the browser's built-in DOMParser to parse your XML input into a document object model tree. Once parsed, the formatter walks the tree recursively and reconstructs the XML string with proper indentation at each nesting level. The parser serves a dual purpose: it validates the XML syntax and converts the input into a structured representation that can be serialized with consistent formatting.
When the input contains a syntax error such as an unclosed tag, mismatched element names or invalid attribute syntax, the DOMParser throws an error that the tool catches and converts into a user-friendly error message. This approach means validation and formatting happen simultaneously — if formatted output appears, your XML is guaranteed to be well-formed. If an error appears instead, you know there is a syntax issue that needs to be fixed. The formatter preserves all semantic content including attributes, text values, comments, CDATA sections and processing instructions while only adjusting whitespace for readability.
Developers and system administrators frequently work with XML in their daily tasks. SOAP-based web services return XML responses that are often minified in logs and network traces. Formatting these responses makes it possible to understand the data structure, debug integration issues and verify that the service is returning the expected fields. Configuration files for Java applications, Android apps and many enterprise systems use XML format, and formatting them makes manual editing much less error-prone.
Data engineers also rely on XML formatters when working with data pipelines that process XML feeds, transform documents using XSLT or validate data against XML Schema definitions. Inspecting large XML documents in their raw form is nearly impossible, but a properly formatted version reveals the structure clearly. Web developers working with SVG graphics, which are XML-based, use XML formatters to clean up SVG code exported from design tools before embedding it in web pages.
All formatting and validation operations happen locally in your browser using JavaScript and the built-in DOM parser. Your XML data is never sent to any server, never stored in any database, and never processed by any third party. The DOM parser is part of your browser's standard library and executes in microseconds, so even large XML documents with thousands of elements are formatted instantly without any loading time or network dependency. You can use this tool with complete confidence that your XML data remains private and secure on your device.
XML stands for Extensible Markup Language. It is a markup language designed for storing and transporting data in a format that is both human-readable and machine-readable. Unlike HTML which has a fixed set of tags, XML lets you define your own tags to describe the structure and meaning of your data. XML is widely used in configuration files, web services, document formats like Microsoft Office Open XML and data exchange between enterprise systems. Its strict syntax rules ensure that XML documents can be parsed reliably and consistently by any compliant parser.
An XML formatter takes XML that is minified, compressed or poorly indented and restructures it with consistent indentation and line breaks so that the hierarchical structure becomes visually clear. Parent elements, child elements and their relationships are shown through progressive indentation, making it easy to see which elements are nested inside others. This is especially useful when working with large XML documents from APIs, configuration files or data exports where the structure may be deeply nested and difficult to follow in a single line of text.
Yes, this tool validates your XML as it formats it. The formatting process requires parsing the XML first, and if the parser encounters a syntax error, the tool displays a clear error message instead of a formatted result. Common errors include unclosed tags, mismatched tag names, invalid attribute syntax, missing root elements and improperly nested elements. The error message helps you identify that something is wrong so you can fix the input before using it in your application or data pipeline.
No, all formatting and validation happens entirely in your browser using JavaScript and the built-in DOM parser. Your XML is never transmitted over the network, never stored in any database, and never processed by any third party. You can safely paste configuration files, SOAP messages, SVG documents or any other XML data containing sensitive information without any risk of the content being exposed or logged on a remote server. The tool works perfectly even without an internet connection.
This formatter supports all standard XML features including element nesting, attributes with single or double quotes, self-closing tags, XML declarations and processing instructions, CDATA sections, comments, namespaces with prefixes, character entity references and mixed content with both text and child elements. The formatter preserves the semantic content of your document while restructuring only the whitespace to improve readability. Attribute values, text content and special sections are never modified during the formatting process.
Last updated on 2026-09-26 · Written by UtiliaTools