Online XML Formatter & Beautifier

What is an XML Formatter? (Tool Introduction)

Extensible Markup Language (XML) is a fundamental data format used everywhere—from SOAP API responses and RSS feeds to RSS syndication and software configuration files (like Android manifests and Spring Boot contexts). Because machines do not require spaces to read XML, this data is heavily minified during transmission.

An Online XML Formatter & Beautifier takes this dense, unreadable wall of text and automatically parses it. By restructuring the code and adding proper indentation, syntax highlighting, and line breaks, it transforms a single line of data back into a readable, logical tree hierarchy, exposing the parent-child relationships between tags immediately.

How to Format and Minify XML

1. Paste your XML Data: Insert your raw XML string or upload your payload into the "XML Input" panel on the left.
2. Select Action: Toggle the "Minify" switch if you want to compress an already formatted file for production. Otherwise, select your preferred Indentation (e.g., 2 Spaces or 4 Spaces) to beautify the code.
3. Process It: Click the Format button. Our XML parser will instantly restructure the document.
4. Download or Copy: The clean, formatted XML will appear on the right. You can inspect the tree, copy it to your clipboard, or click the download icon to save it directly as an .xml file.

Example Input/Output

<?xml version="1.0" encoding="UTF-8"?>
<catalog>
  <book id="bk101">
    <author>Gambardella, Matthew</author>
    <title>XML Developer's Guide</title>
    <genre>Computer</genre>
    <price>44.95</price>
    <publish_date>2000-10-01</publish_date>
  </book>
</catalog>

Primary Use Cases

Developer Explanation: How XML is Parsed

Formatting XML is different from simpler formats like JSON due to the existence of attributes, self-closing tags (<node/>), text nodes, and complex namespaces.

Behind the scenes, our tool strips out the existing arbitrary whitespace and runs a lexical regex scanner over the string. It identifies opening tags (triggering a depth increase +1), closing tags (triggering a depth decrease -1), and self-closing tags (depth remains neutral). It then reconstructs the document line-by-line, applying the configured indentation multiplier. For minification, the process is reversed: the AST (Abstract Syntax Tree) is traversed to strip out safe newlines and spaces while preserving spaces strictly required inside tag attributes or text inner-nodes.

Frequently Asked Questions (FAQ)