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XML Formatter
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XML Formatter

Pretty-print and validate XML with configurable indentation and inline error pointing — turn a minified feed into a readable tree.

Works Offline100% Free

Processed 100% locally in your browserPrivate & Safe

XML Formatter runs entirely on your device using Web API standards. No data is ever uploaded to UtilixVerse servers.

Your Input
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No Server UploadsNo Account RequiredWorks OfflineZero Data Logging
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Input XML
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Paste XML on the left to see it formatted here

Free Online XML Formatter — Beautify, Validate & Minify XML

Welcome to the UtilixVerse XML formatter — a free, browser-basedXML beautifier that turns minified, unreadable XML into clean, indented output in real time. Whether you are debugging an API response, cleaning up a configuration file, or preparing an sitemap, this tool formats, validates well-formedness, and minifiesyour document instantly — without ever uploading it anywhere.

How Our XML Formatter Works

Paste your XML into the input panel and the output updates live as you type. The tool parses your text against the W3C XML 1.0 specification — enforcing well-formedness — then re-serializes it with your chosen indentation (2, 4, or 8 spaces). Toggle Keep comments to strip or preserve<!-- notes, switchSelf-close empty tags between <item/>and <item></item>, and switch toMinified mode for a compact, transfer-ready payload. Copy the result, download it as a .xml file, or import an existing file directly into the editor.

What Makes XML Well-Formed?

An XML document must follow a small set of structural rules to bewell-formed:

  • • Exactly one root element wraps the entire document.
  • • Every open tag has a matching close tag — or is self-closed with <tag/>.
  • • Tags must be properly nested: <a><b></b></a> not <a><b></a></b>.
  • • Attribute values are always quoted with " or '.
  • • Special characters are escaped: &, <, >, ", '.
  • • An optional <?xml version="1.0" encoding="UTF-8"?> declaration may appear first.

Break any of these rules and the formatter stops, pointing you to the exactline and column of the problem — no more hunting through hundreds of lines by hand.

Comments, CDATA & Special Content

Comments (<!-- note -->) are preserved by default and can be stripped with the Keep comments option. Blocks of text that contain characters needing heavy escaping can live insideCDATA sections — <![CDATA[ ... ]]> — where the content is treated literally and passed through unchanged. Our formatter highlights prolog, DOCTYPE, comments, CDATA, tags, and attributes in distinct colors so the document structure is easy to scan.

Pretty-Printed vs. Minified XML

Pretty-printing adds indentation and line breaks for human readability — ideal forcode review, documentation, and debugging. Minifying strips every insignificant character for the smallest possiblepayload size, which matters for API requests, bandwidth limits, and storage. Our formatter shows you both, plus live stats forelements, attributes, text nodes, comments, nesting depth, lines, characters, and bytes, so you can compare the cost of each format at a glance.

Common XML Errors & How to Fix Them

  • • Mismatched tags — <item>...</items> → make open and close names identical.
  • • Unclosed tags — the formatter names the missing closing tag for you.
  • • Multiple roots — wrap everything in a single top-level element.
  • • Unquoted attributes — <tag size=large> → quote it: <tag size="large">.
  • • Bare ampersands — Tom & Jerry must use &.
  • • Unterminated comment or CDATA — <!-- ... needs -->, CDATA needs ]]>.

Tips for Clean XML

  1. 1. Adopt 2-space indentation — the de-facto standard across VS Code and most XML tools.
  2. 2. Use self-closing tags for empty elements to keep documents compact.
  3. 3. Put metadata in attributes, repeated data in child elements — it stays cleaner as documents grow.
  4. 4. Declare encoding="UTF-8" in the XML declaration for broad compatibility.
  5. 5. Validate machine-generated XML (from tools or scripts) before shipping it.

Your data never leaves your device — this is a 100% private, free XML formatter. Pair it with our JSON formatter,JSON validator, andBase64 encoder for a complete developer toolkit.

Frequently Asked Questions About XML Formatting

What is an XML formatter and how does it work?

An XML formatter (also called an XML beautifier or XML pretty printer) takes raw, hard-to-read XML and re-indents every element so the document hierarchy is instantly visible. Our free online XML formatter parses your input strictly against the XML 1.0 specification, checks that it is well-formed, and re-serializes it with clean indentation. It can also minify the output to a single line for compact storage or transfer.

Is this XML formatter safe to use with sensitive data?

Yes — 100% private. All parsing, formatting, validation, and minifying is performed entirely in your browser using JavaScript. Nothing is ever uploaded to a server, so API responses, configuration files (like .config, .csproj, .pom, or AndroidManifest.xml), and build files are safe to paste. The tool even works offline after the page has loaded, and your input is stored only in your own browser for convenience.

What does "well-formed" XML mean?

A well-formed XML document follows the basic grammar rules: exactly one root element, every opening tag has a matching closing tag (or is self-closed with />), tags are properly nested, attribute values are quoted, and special characters like & and < are escaped. A document can be well-formed but still not validate against a DTD or XML Schema — validation checks rules beyond syntax. Our tool checks well-formedness and pinpoints the exact line and column of any problem.

Why does my XML show an error at a specific line or position?

The most common causes of XML errors are: a mismatched or unclosed tag (for example </items> when <item> was opened), two root elements in one document, text content outside the root element, an attribute value without quotes, an unterminated comment or CDATA section, or a bare & character that was not escaped as &amp;. Our formatter displays a friendly error message with a caret pointing at the offending position so you can fix it quickly.

What is the difference between pretty-printed and minified XML?

Pretty-printed XML adds indentation and line breaks so humans can read the structure, at the cost of larger file size. Minified XML removes every insignificant space and newline, producing the smallest possible payload — useful for XML stored in a database, sent over the wire, or embedded in source code. Our tool does both: switch the output mode to Minified to generate a compact version you can copy in one click.

Should I use tabs or spaces for XML indentation, and how many?

Either is valid, but 2 or 4 spaces are the most common conventions for XML (2 spaces is the default in VS Code and most formatters). Some teams prefer tabs because they let each developer choose the visual width. Our formatter lets you switch between 2, 4, or 8 spaces so you can match whatever style your project or API uses.

Can this XML tool remove comments, control empty tags, and minify large files?

Yes to all four. The "Keep comments" option lets you strip every <!-- comment --> from the output — handy when sharing sanitized configs. The "Self-close empty tags" option toggles between <item/> and <item></item> to match your team's style. Minified mode collapses the whole document to one line. And because everything runs in your browser, the tool handles large documents smoothly without any upload limit.

Is this XML formatter really free?

Yes — completely free, with no registration, no sign-up, no premium tier, and no data collection. All formatting happens locally on your device. Pair it with our JSON formatter, JSON validator, and Base64 encoder to cover all your data-handling needs in one place.

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