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About XML Formatter

Format, validate, beautify, and minify XML data instantly. Supports auto-formatting on paste, configurable indentation, element and attribute counting, and any well-formed XML document.

✓Real-time validation
✓Auto-format on paste
✓Minify for production
✓Download as .xml or .txt

Complete Guide to XML Formatting & Validation

Free Online XML Formatter, Validator & Beautifier

Format XML, validate syntax, beautify nested tags, and minify XML data with this free online tool. It is useful for configuration files, API responses, SOAP messages, RSS feeds, SVG files, XHTML, and other XML-based formats.

Key Features

Format & Beautify

  • Auto-format on paste
  • Clean tag indentation
  • 2, 4, or 8-space indentation
  • Inline text preservation
  • Comment and CDATA support

Validate XML

  • Instant well-formedness checks
  • Parser error messages
  • Unclosed tag detection
  • Missing attribute quote detection
  • Invalid character detection

Minify XML

  • Remove extra whitespace
  • Strip comments
  • Reduce file size
  • Optimize for production
  • Single-line output

Statistics & Export

  • Character counts
  • Element and attribute counts
  • Line counts
  • Copy to clipboard
  • Download as .xml or .txt

Why Use This XML Formatter?

Private by design: XML is processed in your browser, so your configuration files and API payloads are not uploaded.

Fast debugging: Paste compressed XML and immediately see readable indentation and validation feedback.

Developer friendly: Use auto-format, custom indentation, copy, download, and sample XML for quick testing.

Works with common XML: Use it with SOAP, RSS, Atom, SVG, XHTML, Maven, Android manifests, and other XML files.

How to Format XML Online

  1. Paste XML: Paste your XML data into the input panel. Auto-format is enabled by default.
  2. Choose indentation: Select 2, 4, or 8 spaces to match your project style.
  3. Format or minify: Click Format to beautify XML or Minify to compress it for production.
  4. Validate: Check whether the XML is well-formed and review parser errors when something is invalid.
  5. Export: Copy the result or download it as an .xml or .txt file.

What is XML?

XML (eXtensible Markup Language) is a markup language for storing, transmitting, and describing structured data. Unlike HTML, XML lets you define your own tags, which makes it useful for cross-system data exchange and configuration.

XML Structure Elements:

Elements: Opening and closing tags such as <name>John</name> that can be nested into a hierarchy.

Attributes: Name-value metadata inside opening tags, such as <book id="1">. Attribute values must be quoted.

Declaration: An optional processing instruction such as <?xml version="1.0"?> at the top of a document.

Comments: Notes enclosed in <!-- --> that XML parsers ignore.

CDATA: Text sections enclosed in <![CDATA[ ]]> for content that should not be parsed as markup.

Namespaces: URI-qualified names that prevent collisions when XML from multiple sources is combined.

Common XML Use Cases

Configuration files: Maven pom.xml, web.xml, .csproj, AndroidManifest.xml, Info.plist, and other application config files.

SOAP web services: SOAP APIs use XML envelopes for request and response messages.

RSS and Atom feeds: Blog and news feeds are distributed as XML documents.

SVG graphics: SVG is XML-based, so formatting makes paths and shapes easier to inspect.

Enterprise data exchange: XML is common in EDI, healthcare HL7, finance XBRL, and legacy integrations.

Document formats: DOCX, XLSX, ODF, and similar files are archives containing XML documents.

XML Well-Formedness Rules

  • Every XML document must have exactly one root element.
  • Opening and closing tags must be properly nested.
  • Every opening tag must close, or be self-closing like <br/>.
  • XML is case-sensitive, so <Name> and <name> are different.
  • All attribute values must be wrapped in single or double quotes.
  • Special characters in text should use entity references such as &lt;, &gt;, and &amp;.

Common XML Errors & Fixes

Unclosed tags: Make sure every <tag> has a matching </tag>.

Improper nesting: Close tags in reverse order, for example <a><b></b></a>.

Unquoted attributes: Use <tag attr="value"> instead of <tag attr=value>.

Unescaped characters: Escape ampersands and angle brackets inside text content.

Multiple roots: Wrap multiple top-level elements in a single container element.

Perfect For

  • Software developers
  • System administrators
  • API developers and testers
  • Data analysts
  • DevOps engineers
  • Enterprise developers
  • QA teams
  • Technical writers
  • XML/XSLT developers
  • Web service developers
  • Mobile app developers
  • Students learning XML

Complete Privacy Protection

All XML formatting, validation, and processing happens entirely in your web browser using JavaScript. Your XML data is never uploaded, stored, logged, or sent to any third party.

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