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XML Formatter

Format and validate XML with line numbers and error reporting.

Format and validate XML with line numbers and error reporting.

Accepts:XML→Outputs:XML
Quick start: Paste your XML document or fragment into the input area. → Click 'Format' to apply proper indentation and line breaks at each nesting level. → Review any validation errors — malformed tags and unclosed elements are flagged with line numbers.

Supported formats

Input formats
XML
Output formats
XML

How to use XML Formatter

  1. 1

    Paste your XML document or fragment into the input area.

  2. 2

    Click 'Format' to apply proper indentation and line breaks at each nesting level.

  3. 3

    Review any validation errors — malformed tags and unclosed elements are flagged with line numbers.

  4. 4

    Copy the formatted XML with one click.

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Why use XML Formatter?

  • Proper indentation at every nesting level makes complex XML structures easy to navigate.
  • Built-in validation catches malformed tags, unclosed elements, and syntax errors.
  • Handles large documents (megabytes of XML) without performance issues.
  • Runs entirely in your browser — no data is sent to a server.

Common use cases

  • Format and inspect SOAP API responses for debugging web service integrations.
  • Clean up XML configuration files from application servers for readability.
  • Validate XML exports from databases or enterprise systems before importing them elsewhere.
  • Format SVG files (which are XML-based) for manual inspection and editing.

Limitations & things to know

  • Very large documents (50MB+) may slow down the browser
  • DTD and XSD schema validation is not supported

About XML Formatter

XML is still widely used in SOAP APIs, enterprise configurations, data feeds, SVG files, and legacy systems. Reading unformatted XML is nearly impossible when elements are deeply nested or the document spans thousands of lines. Xevon Tools' XML Formatter applies proper indentation at every nesting level and validates the document for well-formedness, flagging mismatched tags and unclosed elements with line numbers. The tool handles large documents up to several megabytes without performance issues. Namespace prefixes are preserved and formatted correctly. This is essential for debugging SOAP responses, inspecting configuration files, validating data exports, and editing SVG markup. Everything runs in your browser, so sensitive XML data from enterprise systems stays private.

Frequently asked questions

Yes. The formatter handles documents up to several megabytes without significant slowdown on modern devices. Very large files (50MB+) may cause the browser to pause briefly.
Yes. The tool checks for well-formedness — mismatched tags, unclosed elements, and syntax errors are reported with line numbers. It does not validate against DTD or XSD schemas.
Yes. Namespace prefixes and declarations are preserved and formatted correctly. The tool treats them as standard XML attributes.
The primary focus is formatting for readability. To minify XML, you can strip the formatted output of whitespace, but a dedicated minify mode is planned for a future update.

Your files never leave your device

Every tool on Xevon Tools runs 100% in your browser. No uploads, no servers, no tracking. Free forever.

Learn more

Embed XML Formatter on your site

Add this tool to your own website, blog, or internal tool page with one line of code. Free to use, no attribution required (but appreciated).

<iframe src="https://www.xevontools.com/embed/xml-formatter" width="100%" height="640" style="border:1px solid #e2e8f0;border-radius:12px;" title="XML Formatter — Xevon Tools"></iframe>
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