XML Formatter Online - No Signup

Beautify, validate, or minify XML with accurate handling for namespaces, attributes, comments, CDATA, processing instructions, declarations, empty elements, and mixed content. Everything runs locally in your browser.

Format XML See how it works
No XML uploads Syntax validation Mixed-content aware Format and minify

XML Formatter & Validator

Paste XML or open a UTF-8 file. Choose your formatting preferences, then beautify, validate, minify, copy, or download the result.

100% local processing
Limit: 1,000,000 characters or a 5 MB UTF-8 file
XML input
Untitled.xml Ctrl/⌘ + Enter formats · Ctrl/⌘ + S downloads
XML output Not validated
Waiting for XML 0 characters
Ready. XML remains in this browser.
Elements 0
Attributes 0
Text nodes 0
Namespaces 0
Maximum depth 0
Input size 0 B
Output size 0 B
Processing 0.0 ms
Document Add XML to inspect its structure
01
Private by design XML stays on your device
02
Accurate validation Malformed syntax is identified
03
XML-aware output Namespaces and CDATA are preserved
04
Flexible workflow Paste, open, copy, or download
Readable structured data

Format XML without changing its data model

This XML Formatter parses XML into a browser document model before creating readable output. It helps developers, analysts, testers, and technical writers inspect APIs, configuration files, feeds, sitemaps, schemas, SVG documents, and other XML-based formats.

Unlike a simple regular-expression formatter, the serializer understands elements, ordered attributes, namespaces, text nodes, CDATA sections, comments, processing instructions, document types, and empty nodes.

Mixed-content elements receive special handling. When readable text and child elements appear together, the formatter avoids injecting indentation that could change the element's textual meaning.

Private XML validation in your browser

Input is parsed locally and never submitted by this template. Entity declarations and external DTD references are rejected before parsing to reduce unsafe or unexpectedly expensive XML processing behavior.

Practical XML tooling

Everything needed to inspect and clean XML

A focused XML workspace with accurate parsing, useful controls, safe local processing, and clear document metrics.

Semantic XML formatting

XML nodes are parsed and serialized according to their node type instead of being split with fragile text patterns.

Local and defensive

XML stays in your browser, while entity declarations and external DTD references are rejected before parsing.

Clear validation feedback

Detect mismatched elements, malformed attributes, invalid characters, and incomplete XML with available locations.

Beautify or minify

Generate readable indented XML or compact output while retaining significant textual content.

Local file workflows

Select or drag a UTF-8 XML, XSD, SVG, RSS, or Atom file and process its text without a server upload.

Useful XML metrics

Review element, attribute, text-node, namespace, depth, byte-size, root-element, and processing-time details.

Three simple steps

How to format XML online

Beautify and validate XML without installing software or creating an account.

Step 1

Add XML

Paste XML into the input editor or open a strict UTF-8 XML file from your device.

Step 2

Format or validate

Choose indentation and declaration options, then beautify, validate, or minify the document.

Step 3

Copy or download

Copy the resulting XML, use it as new input, or download a clean UTF-8 XML file.

Reliable results

XML formatting best practices

Keep these practical considerations in mind when cleaning and validating production XML.

1

Validate before publishing

A readable document can still be invalid. Confirm that the parser reports valid XML before using the output.

2

Review mixed content carefully

Text-heavy XML may treat whitespace as data. This formatter keeps mixed content compact to avoid adding it.

3

Use xml:space when required

Add xml:space="preserve" where text whitespace must remain intact through formatting and serialization.

4

Keep source files available

Preserve original XML before applying whitespace cleanup or replacing documents in a production workflow.

Common questions

XML Formatter FAQ

What does an XML formatter do?

An XML formatter parses XML and reorganizes its indentation and line breaks to make elements, attributes, comments, CDATA sections, and nested structures easier to read.

Is this XML formatter free?

Yes. The XML formatter is free to use, requires no account, and lets you format, validate, minify, copy, and download XML without watermarks.

Is my XML uploaded to a server?

No. XML parsing, validation, formatting, minification, copying, and file generation happen locally inside your browser.

Does the formatter preserve XML namespaces and CDATA?

Yes. Namespace-qualified element and attribute names, CDATA sections, comments, processing instructions, declarations, and safe document types are preserved.

Can this tool validate malformed XML?

Yes. The tool detects XML parsing errors such as mismatched tags, invalid attributes, unescaped characters, and incomplete documents, and reports available line and column details.

Why are external DTDs and entity declarations rejected?

Entity declarations and external SYSTEM or PUBLIC document types are rejected to avoid unsafe or unexpectedly expensive entity expansion and external-resource behavior.

Can I open and download XML files?

Yes. You can open or drag a UTF-8 XML file up to 5 MB, format it locally, and download the resulting XML file.

Continue working

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Ready to clean and validate your XML?

Format XML privately with semantic parsing, mixed-content-aware output, clear validation, document metrics, and flexible copy and download actions.

Open XML Formatter