UFOZoo

XML Formatter — Beautify, Validate & Minify XML Online

Format and beautify XML with custom indentation. Features syntax highlighting, instant minification, error detection, and CDATA section support.

Features

  • ✓Real-time XML formatting as you type — paste and it formats instantly with proper indentation and line breaks
  • ✓Custom indentation options — choose between 2 spaces, 4 spaces, or tab characters to match your coding style
  • ✓Syntax highlighting with color-coded tags (blue), attributes (amber), strings (green), comments (gray), CDATA sections (purple), and processing instructions (orange)
  • ✓One-click minification for production — remove all unnecessary whitespace to reduce file size significantly
  • ✓XML validation with error detection — identify syntax errors with precise line and column positioning
  • ✓Support for XML comments, CDATA sections, processing instructions, and complex nested structures
  • ✓Drag-and-drop files — simply drag .xml files into the input area or use the open button
  • ✓One-click copy to clipboard or save as .xml file — formatted or minified versions available
  • ✓100% client-side processing — your XML data never leaves your browser, ensuring complete privacy and security

How to Use

  1. 1Paste your XML document into the left editor area — it will format automatically as you type
  2. 2Choose your preferred indentation style: 2 spaces, 4 spaces, or tab from the toolbar options
  3. 3Switch between 'Formatted' and 'Minified' tabs to view either beautified or compressed output
  4. 4Use the Copy button to copy the result to clipboard, or Download to save it as an .xml file
  5. 5Drag and drop a .xml file onto the input area to load it instantly instead of pasting
  6. 6When validation errors occur, look for the error indicator near the line number — the error message shows the approximate line and column
  7. 7Use the Upload button to open an XML file from your device's file picker
  8. 8Compare formatted vs minified versions side by side to understand what whitespace was removed

Frequently Asked Questions

What is XML formatting?

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XML formatting (also called beautifying or pretty-printing) adds proper indentation, line breaks, and spacing to make XML documents easier to read and understand. It transforms compact, hard-to-read XML into a well-structured, hierarchical format that clearly shows the document's nesting structure.

How does XML minification work?

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XML minification removes all unnecessary whitespace including indentation, line breaks, and extra spaces between tags while preserving the document's semantic meaning. This reduces file size significantly, making it ideal for production environments where bandwidth matters.

Does this tool support XML validation?

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Yes! The formatter performs basic XML syntax validation and will highlight any errors found in your document, showing the error message along with the approximate line number where the issue was detected.

Can I use this tool for large XML files?

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Yes, the tool can handle large XML files efficiently since all processing happens in your browser. However, extremely large files (10MB+) may experience slower performance due to browser memory limitations.

Is my XML data secure?

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Absolutely! All XML processing is done entirely in your browser using JavaScript. No data is ever sent to our servers or stored anywhere. Your documents remain completely private on your device.

What XML features are supported?

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The formatter supports all standard XML features including: elements and attributes, comments (<!-- -->), CDATA sections (<![CDATA[...]]>), processing instructions (<?xml ...?>), namespaces, nested structures, self-closing tags, and special character entities.

Can I customize the indentation style?

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Yes! You can choose between 2-space indentation, 4-space indentation, or tab characters. Select your preferred style from the toolbar options in the formatted view to match your project's coding standards.

How do I save the formatted XML?

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Click the save button in the output toolbar to save the formatted or minified XML as a .xml file. Alternatively, use the copy button to copy the result to your clipboard and paste it into your editor.

Why would I need to format XML?

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Formatted XML is essential for debugging configuration files (web.config, pom.xml), working with SOAP/REST APIs, editing SVG graphics, processing RSS feeds, validating sitemaps, and collaborating with team members who need to read and modify XML documents.

How do I know if my XML has errors?

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The validator checks for: unmatched tags (each opening tag needs a matching closing tag), improper nesting, invalid characters in attribute values (like unescaped &), missing quotes around attribute values, and malformed comments or CDATA sections. Errors are shown with the approximate line number — look for the red error indicator next to the line numbers.

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