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Format and validate XML with indentation and well-formedness checks. Use for XML; for JSON use json-formatter, for XML to JSON conversion use xml-to-json. Input: XML ≤10MB. Returns formatted XML or line-numbered error. 100% client-side.
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XML formatter supporting indent options of 2 spaces, 4 spaces, or tabs with minification mode that strips all whitespace. Removes XML comments optionally, controls self-closing element style (<tag/> vs. <tag></tag>), sorts attributes alphabetically, chooses single or double quotes for attribute values, toggles XML declaration inclusion, and validates well-formedness with error reporting.
XML files from different sources have wildly inconsistent formatting. This tool normalizes any XML to a consistent style while validating its structure, helping teams maintain readable and uniform XML across their projects.
This tool is part of the DevStackIO platform — a collection of free online developer tools from DevStackIO. Browse more free developer resources on DevStackIO.
Backend developers, configuration engineers, DevOps practitioners, and anyone who creates or maintains XML configuration files, data exchanges, or SOAP messages.
Paste or type XML content into the input area.
Select indent: 2 spaces, 4 spaces, or tab.
Toggle options: Remove Comments (strips <!-- -->), Self-Closing (/> vs. <tag></tag>), Sort Attributes (alphabetical), Quote Style (single or double), and XML Declaration (include <?xml?> or not).
Click Format to process; the formatted output appears in the result panel.
Check the Validation section for well-formedness status — errors show line number, column, and description.
Click Copy to copy the formatted XML or Download to save as .xml file.
Input: "<root><item id=\"1\" name=\"test\"><![CDATA[hello]]></item></root>" (2-space indent, sort attributes, double quotes) → Output: "<root>\n <item id=\"1\" name=\"test\">\n <![CDATA[hello]]>\n </item>\n</root>"Input: invalid XML "<root><item>text</item>" → Validation: "Error at line 1 column 23: XML document must have a root element that encloses all content"Does it preserve CDATA sections? Yes
CDATA sections are preserved and indented as block content.
What validation checks are performed?
Well-formedness checks: matching start/end tags, proper nesting, valid attribute syntax, entity references, and encoding declarations.
Can it format XML without a root element? No
the input must be well-formed XML with a single root element.
Does it handle namespaces? Yes
namespace prefixes and xmlns attributes are preserved and sorted along with other attributes.
Authoritative specifications, standards, and in-depth reading for XML Formatter/Validator.
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