XML Formatter & Beautifier

XML Formatter & Beautifier Online — Free, Instant, No Install

Paste any XML and it formats instantly in your browser — minified API responses, config files, RSS feeds, or malformed SOAP payloads all come out readable in under a second. No server, no account, no data ever leaving your device.

Unlike basic XML formatters that only indent and copy, this tool includes six integrated features in one place: formatting, minification, interactive tree view, XPath query, XML diff, and conversion to JSON and CSV. Developers who work with XML APIs, SOAP services, or RSS feeds use it to understand structure, extract data, and compare versions — not just pretty-print.

How to Use the XML Formatter

1. Paste your XML into the left panel — raw, minified, or partially indented — and the validator immediately shows whether the XML is well-formed, along with the exact error line if it isn't.
2. Read the formatted output in the Format tab on the right — properly indented with your chosen indent size (2 spaces, 4 spaces, or tabs), the declaration preserved, and comments intact unless you explicitly remove them.
3. Copy or download the result — click Copy to send the formatted XML to your clipboard, or Download to save it as a .xml file for use in your project.
4. Switch tabs to explore beyond formatting: Tree for a collapsible node view, XPath to query specific elements, Diff to compare two XML documents, Convert to export as JSON or CSV.
5. Load from URL — paste any public URL that returns XML (an RSS feed, a sitemap, an API endpoint) into the URL field and click Fetch to load and format it automatically.

XML Formatter Examples

Example 1 — Minified API response:

Input:  <catalog><book id="bk101"><title>XML Developer's Guide</title><price>44.95</price></book></catalog>
Output: <catalog>
          <book id="bk101">
            <title>XML Developer's Guide</title>
            <price>44.95</price>
          </book>
        </catalog>

Example 2 — XPath query to find books over $10:

XPath:  //book[price > 10]
Result: <book id="bk101">
          <title>XML Developer's Guide</title>
          <price>44.95</price>
        </book>

Example 3 — XML to JSON conversion:

Input XML:  <user id="42"><name>Alice</name><role>admin</role></user>
JSON output: {
               "user": {
                 "@id": "42",
                 "name": "Alice",
                 "role": "admin"
               }
             }

Example 4 — Edge case: XML with namespace declarations:

Input:  <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
          <soap:Body/>
        </soap:Envelope>
Output: Correctly formatted with namespace prefix preserved — no stripping or rewriting of xmlns attributes.

XML — What It Is and Why Developers Still Use It

XML (eXtensible Markup Language) is a text-based format for structured data. Unlike HTML, the tags are not predefined — developers define their own tag names to describe the data they're modeling. Every XML document has exactly one root element, every tag must be closed, and tag names are case-sensitive.

JSON has replaced XML for most REST APIs, but XML remains dominant in specific domains: SOAP web services in banking and enterprise software, RSS and Atom feeds for content syndication, Android layout files, Maven pom.xml and Spring configs, SVG graphics, and the Office Open XML formats inside .docx and .xlsx files. If you work in any of these areas, a capable XML formatter is a daily tool, not an occasional utility.

Common Use Cases

• Debugging SOAP responses: Enterprise APIs return SOAP responses as single-line XML strings. Paste the response and format it to understand the envelope, headers, and body structure in seconds.
• Reading RSS/Atom feeds: Blog feeds and podcast feeds are XML. Load one by URL to see the item structure, extract titles, or identify which fields a feed actually provides.
• Android layouts: Android Studio's XML layout files are easier to review and diff in a web formatter than inside the IDE when you're reviewing a pull request.
• Maven and Spring configs: pom.xml and application context files often become deeply nested. The tree view makes navigating 10+ levels of nesting manageable.
• Sitemaps: sitemap.xml files can contain thousands of URLs. Convert to CSV to import into a spreadsheet for SEO analysis.
• Comparing API versions: Use the Diff tab to compare XML responses from two API versions side by side and immediately see what changed.

Frequently Asked Questions

What is an XML formatter and what does it actually change?

An XML formatter (also called XML beautifier or XML pretty printer) adds indentation and line breaks to make XML readable — it does not change the data at all. The document after formatting is semantically identical to the original. Whitespace between tags in most XML vocabularies is insignificant, so formatting is a safe operation for debugging, reading, and editing.

Is my XML sent to a server when I use this tool?

No. Parsing, formatting, XPath evaluation, diff computation, and conversion all run in your browser using built-in JavaScript and browser APIs (DOMParser, document.evaluate). Your XML never leaves your device — important when working with credentials in XML files, internal SOAP payloads, or confidential configuration.

What is XPath and how do I use the XPath query tab?

XPath (XML Path Language) is a query language for selecting nodes in an XML document. Type any XPath expression in the query field — for example //book[@genre='Fantasy'] to select all book elements with a specific attribute, or count(//item) to count elements. The tab shows all matching nodes serialized as XML, so you can copy exactly the data you need without writing code.

What does the XML diff do and when should I use it?

The Diff tab normalizes both XML documents (formats them with consistent indentation) before comparing, so structural differences like indentation and attribute ordering don't create false positives. Additions appear in green, deletions in red. Use it to compare API response versions, review configuration changes, or verify that an XML transformation produced the expected output.

Does the formatter support XML namespaces and CDATA sections?

Yes. Namespace prefixes and xmlns declarations are preserved exactly as-is. CDATA sections (<![CDATA[...]]>) are preserved in the Format tab and displayed in the Tree tab. The tree view labels CDATA nodes separately so they're easy to identify in deeply nested documents.

Resources

• W3C XML 1.0 Specification — the authoritative specification for XML syntax, well-formedness rules, and character encoding requirements.
• MDN — XPath — complete XPath 1.0 reference with axis descriptions, node types, and function documentation.
• W3Schools — XPath Tutorial — practical introduction to XPath expressions with interactive examples for common query patterns.