XML is the lingua franca of configuration files, SOAP APIs, RSS feeds, Android layout files, Maven pom.xml, Spring beans, Swagger 2.0 specs, Microsoft Office document internals (DOCX, XLSX are ZIP archives of XML files), and dozens of other formats that developers interact with daily. When XML arrives minified — as a single unbroken line from a SOAP response or a serialized config payload — it is completely unreadable. When a config file has a mismatched tag or a missing namespace declaration, the error messages from most parsers are cryptic. The Utility Spark XML Formatter parses your raw XML using the browser's built-in DOMParser API, validates it for well-formedness, and re-serializes it with clean, indented formatting. Invalid XML produces a specific, human-readable error message pointing to the problem. Valid XML can be formatted with your choice of indentation or minified back to a compact single line. The entire operation runs in your browser — SOAP payloads that may contain PII, config files with credentials, and proprietary data structures never leave your device.
lightbulb When to use this tool
- check_circle Formatting a minified SOAP API response to inspect its envelope, headers, and body structure during API integration debugging.
- check_circle Validating an Android layout XML file or Spring configuration file before committing to identify well-formedness errors.
- check_circle Reading the internal XML structure of a .docx, .xlsx, or .pptx file by renaming it to .zip, extracting, and formatting the XML files.
- check_circle Formatting an RSS or Atom feed to inspect its structure and verify required elements are present.
- check_circle Minifying a production XML config file to reduce file size before deploying to a server.
Why use our tool?
Browser's Native DOMParser — Spec-Compliant Validation
XML formatting uses the browser's built-in DOMParser API, which implements the W3C XML specification. This means validation is authoritative — if the parser accepts your XML, it is genuinely well-formed per the spec. The same parser that Chrome and Firefox use internally validates your document.
Specific Error Messages — Not Just 'Invalid XML'
When parsing fails, the browser's DOMParser returns an error document with a specific parsererror element describing the problem — unclosed tag, illegal character, duplicate attribute, undeclared namespace prefix, or encoding mismatch. The formatter surfaces this message so you can find and fix the error rather than searching blindly.
Format and Minify Both Directions
Prettify minified XML for human reading, or minify formatted XML for production use. Both directions run instantly with no server round-trip. Minified XML for API payloads or config storage can be hundreds of bytes smaller than the formatted equivalent.
Configurable Indentation
Choose between 2-space, 4-space, or tab indentation. XML indentation standards vary by ecosystem — Java projects typically use 4 spaces, web/JavaScript projects often use 2 spaces, and some teams prefer tabs. The choice affects presentation only, not structure.
Your XML Never Leaves Your Browser
SOAP payloads frequently contain authentication tokens, user data, and transaction details. Android config files contain API keys. Maven pom.xml files reveal dependency trees and internal tooling. All formatting runs client-side — no XML content is transmitted externally.
How it works
Paste your raw or minified XML into the input area.
The tool validates the XML immediately. If well-formed, it formats the output. If invalid, it displays the specific parser error.
Select your indentation preference: 2 spaces, 4 spaces, or tabs.
Click 'Copy Formatted XML' for the beautified version, or 'Minify' for the compact single-line version.
For SVG files, paste the SVG source directly — SVG is XML and formats correctly with this tool.
Examples
science Formatting a SOAP Response
Input (minified): <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"><soap:Body><GetUserResponse><UserId>123</UserId><Name>Jane Doe</Name></GetUserResponse></soap:Body></soap:Envelope>
Output: Indented envelope with Body, GetUserResponse, UserId and Name on separate lines — immediately readable
science Detecting a Missing Closing Tag
Input: <config><database><host>localhost</host><port>5432</port></config>
Error: parsererror: <database> tag is not closed before </config>
Fix: Add </database> before </config>