YAML Validator
Validate YAML 1.2 syntax, duplicate keys, and bounded alias references.
Open toolXML Formatter
Format XML online with two or four spaces of indentation. Paste a well-formed document without a DOCTYPE, inspect its nesting and copy or download the result.
Free to useNo sign-upRuns in your browser
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Enter the inputs, then select Format XML.
Your result
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Result will appear here
How XML Formatter works
The formatter checks XML for well-formed structure without a DOCTYPE, then indents elements using the selected width.
Mixed content and xml:space preservation are kept together. The generated XML can be copied or downloaded, but well-formedness does not prove conformity to an XSD or application schema.
Check unmatched tags, unescaped ampersands, and missing quoted attribute values against the original source.
How to use XML Formatter
Paste an XML document and choose two or four spaces for indentation.
Supply XML and indentation
Paste one XML document and choose two-space or four-space indentation. The source must be well formed and must not include a DOCTYPE. Keep mixed content and whitespace-preservation attributes intact.
XML
Format the element structure
Run the formatter and inspect the Formatted XML output. The indentation makes element nesting easier to follow while mixed content is kept together.
Ready
Copy or download the XML
Use the text controls to copy the result or download formatted.xml. Read the preservation note and review it with the actual consumer. Well-formed XML is not evidence of XSD conformity.
Output and export
When to use XML Formatter
Use readable XML when inspecting structure without changing the document into another data format.
Beautify an XML API response
Format a copied XML response to locate nested elements and attributes more easily. Look at the actual values after finding the desired branch. Formatting does not confirm that the response matches an API contract or that its values are valid.
Indent XML configuration for review
Use indentation to inspect parent and child relationships in an XML configuration excerpt. Validate the final file in the application that consumes it, since well formed XML can still contain unsupported elements or incorrect configuration values.
Prepare a documentation sample
Create a readable XML example for a technical explanation. Preserve meaningful text, comments, and CDATA from the sample instead of replacing them with invented content. Review the accompanying explanation separately so it describes the actual document rather than its visual layout.
Check XML well-formedness versus XSD validation
Read the formatted structure alongside any mixed content or preserved whitespace in the original document.
The input is checked for well formed XML, and the formatter handles comments, CDATA, mixed content, and xml:space preservation. The resulting indentation is not evidence of compliance with an XSD.
DOCTYPE declarations are rejected. This tool does not resolve external entities or load a DTD, so documents depending on those features need a different review workflow.
Check XML parsing errors
Use the reported location to inspect the original XML before changing tags, attributes, or escaped characters.
Check unmatched tags, unescaped ampersands, and missing quoted attribute values against the original source. Avoid repairing an excerpt by guessing missing content when a complete source document is available.
Input is limited to 100000 characters. If another application rejects the formatted result, inspect that application schema and requirements in addition to the XML syntax checked here.
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Open toolFormat and download readable XML
Paste an XML document and choose two or four spaces for indentation.
XML Formatter: common questions
Answers about using XML Formatter and understanding its results.
Will it fetch an external entity?
No. Documents containing a DOCTYPE are rejected.
Does it validate an XSD?
No. It checks well-formed XML, not a schema.
Which indentation widths are available?
Choose two spaces or four spaces in the form.
How are text and inline elements treated?
Mixed content is kept together rather than expanded into unrelated lines. Review whitespace-sensitive consumers before replacing the original.