XML Formatter Online — Beautifier, Validator & Minifier

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How to XML Formatter Online

1. 1

   Paste your XML document into the input editor, or click the Upload button to load an .xml, .rss, .svg, or .wsdl file directly from your machine.

2. 2

   Configure your preferred formatting options: select 2 spaces, 4 spaces, or tab indentation, and optionally toggle attribute alphabetical sorting for cleaner Git diffs.

3. 3

   Click Format or press ⌘↵ (Ctrl+Enter on Windows/Linux) to beautify and indent your XML hierarchy with syntax highlighting.

4. 4

   Use Validate (⌘⇧V) to inspect structural well-formedness with exact line and column error indicators, or Minify (⌘⇧M) to strip non-significant whitespace for production payloads.

5. 5

   Click XML → JSON to transform your XML element tree and attributes into structured JSON objects and arrays.

6. 6

   Copy the formatted XML with ⌘⇧C, download it to disk as an .xml file, or generate a compressed URL to share the snippet with your team.

XML Formatter Features

• ✓

  Configurable indentation engine: Beautify XML with 2 spaces, 4 spaces, or tab characters to conform with project formatting standards.

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  Lexical syntax validator: Detects unclosed tags, mismatched closing tags, and malformed attributes with exact line and column coordinates and actionable suggestions.

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  Deterministic attribute sorting: Alphabetizes XML element attributes to eliminate noisy Git diff churn during code reviews.

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  Lossless namespace preservation: Fully supports default namespaces (xmlns), prefixed namespaces (xmlns:prefix), and schemaLocation declarations without URI corruption.

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  CDATA section preservation: Correctly isolates <![CDATA[ ... ]]> blocks, preserving embedded raw HTML, code, and special characters.

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  Processing instructions & DOCTYPE support: Preserves XML declarations (<?xml ...?>), stylesheet links (<?xml-stylesheet ...?>), and DOCTYPE headers at the document prolog.

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  Production XML minifier: Collapses nested tags and removes non-significant whitespace and comments while preserving text content and CDATA nodes.

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  XML to JSON conversion: Intelligently converts XML structures to JSON, mapping repeated sibling elements into arrays and attributes to @ keys.

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  Multi-vocabulary support: Handles SOAP 1.1/1.2 envelopes, WSDL specs, RSS 2.0/Atom feeds, SVG vector graphics, Maven POMs, and Android XML layouts.

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  Zero-latency live mode: Formats and validates input continuously in real-time as you type, paste, or modify XML nodes.

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  Gzip-compressed URL sharing: Compresses your XML document into a compact URL parameter for instant teammate sharing without server storage.

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  100% client-side privacy: All lexical parsing and formatting executes locally in your browser sandbox—zero data is ever transmitted to external servers.

Supported Formats & Dialects

The XML Formatter supports 6 syntax formats and dialects for accurate parsing and processing.

W3C XML 1.0 & 1.1 Standard

The universal standard markup specification for hierarchical data, supporting single root tags, UTF-8/UTF-16 encoding, and strict well-formedness rules.

SOAP 1.1 / 1.2 Web Services

Enterprise RPC message envelope format with Header, Body, and Fault structures utilizing explicit xmlns:soap namespace bindings.

RSS 2.0 & Atom Syndication

Web publication and syndication feed schemas featuring channel metadata, item enclosures, publication timestamps, and CDATA content blocks.

SVG (Scalable Vector Graphics)

W3C vector graphics markup format using XML nodes, viewports, viewBox dimensions, linear gradients, and path coordinate attributes.

Maven POM & Ant Build XML

Java ecosystem Project Object Model (pom.xml) and Apache Ant build configuration files containing dependency trees and build plugins.

Office Open XML & Android Layouts

Document architectures (.docx, .xlsx XML structures) and native Android UI layout hierarchy XML files with res-auto namespace attributes.

Frequently Asked Questions

What is the difference between well-formed XML and schema-valid XML?

Well-formed XML adheres strictly to W3C syntactic grammar: it must contain exactly one root element, properly nested and case-sensitive closing tags, correctly quoted attribute values, and escaped reserved entities (&lt;, &amp;). Schema-valid XML goes beyond syntax to verify that the element hierarchy, data types, and attribute constraints conform to a formal Document Type Definition (DTD) or XML Schema Definition (XSD).

How does the formatter handle XML namespaces (xmlns and xmlns:prefix)?

The parser preserves all default (xmlns="...") and prefixed (xmlns:prefix="...") namespace declarations. Namespace URIs, prefix scoping, and schemaLocation attributes are retained exactly as defined, ensuring specialized vocabularies such as SOAP envelopes, SVG graphics, and SAML assertions retain full semantic validity.

How are CDATA (<![CDATA[ ... ]]>) sections processed during formatting and minification?

CDATA (Character Data) sections allow embedding raw text, unescaped HTML, or scripting code containing reserved characters (<, >, &) without entity escaping. The formatter preserves CDATA blocks intact, indenting the enclosure wrapper while keeping internal character sequences unaltered across both beautification and minification.

How are XML Processing Instructions (<?pi ...?>) and DOCTYPE declarations handled?

Top-level and inline processing instructions (such as <?xml-stylesheet type="text/xsl" href="style.xsl"?>) and <!DOCTYPE ...> declarations are parsed as first-class AST nodes. They are preserved in the document prolog preceding the root element with exact syntax retention.

How does attribute sorting improve code reviews and Git diffing?

When attribute sorting is enabled, element attributes are ordered alphabetically by attribute name. Because XML attribute ordering is semantically non-significant according to W3C standards, normalizing attribute order eliminates noisy, false-positive diff lines when comparing XML documents generated across different backend libraries or API endpoints.

How does the XML to JSON converter translate attributes, text nodes, and repeating child elements?

The converter maps child elements to JSON object keys. When multiple sibling elements share identical tag names (such as repeated <item> elements in an RSS feed), they are automatically grouped into a JSON array. Element attributes are mapped with an "@" prefix, and mixed text content is captured under a "#text" property.

What are XML External Entity (XXE) vulnerabilities and how is client-side safety guaranteed?

XML External Entity (XXE) attacks exploit vulnerable server-side XML parsers that resolve external DTD entities (<!ENTITY xxe SYSTEM "file:///etc/passwd">), potentially causing local file disclosure or SSRF. DevFlow XML Formatter runs entirely within your browser using pure client-side JavaScript without resolving external network entities or sending data to a server, guaranteeing complete safety.

Does the formatter support SOAP envelopes, WSDL files, SVG graphics, and RSS/Atom feeds?

Yes. All standard XML vocabularies and dialect schemas—including SOAP 1.1/1.2 envelopes, WSDL definitions, SVG vector graphics, RSS 2.0/Atom feeds, Android layout XML, and Apache Maven pom.xml files—are fully supported with accurate nesting and comment preservation.

How does the error validator pinpoint syntax mistakes with line and column pointers?

The SAX-style parser tracks byte offsets and newline boundaries during lexical tokenization. When a syntax error occurs—such as an unclosed tag, mismatched closing tag, or unquoted attribute—the validator identifies the exact 1-indexed line number, column offset, and an actionable suggestion to fix the markup.

Is my XML payload, proprietary API schema, or SOAP message sent to any external server?

No. All parsing, validation, beautification, minification, and XML-to-JSON transformations execute 100% locally in your browser using client-side TypeScript. Your proprietary XML schemas, confidential SOAP requests, and database export files never leave your device.

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