Format XML - Best Free Online XML Tools

XML Formatter — Free Online Tool

Beautify and re-indent XML online, free. XML is a self-describing markup language for structured documents and data interchange. This formatter re-indents minified or messy XML with consistent spacing so it is readable and diff-friendly — processing runs in your browser with nothing uploaded.

🚀 Why use this XML Formatter tool?

It expands compressed XML back into a clean, consistently indented form without changing its meaning. 100% free, no registration, and complete privacy — everything runs locally in your browser, so your data never touches a server.

Key Features

Instant beautify

Paste minified or messy XML and get clean, indented output immediately — no upload wait.

📐Consistent indentation

Normalises spacing and nesting so the whole file follows one style, ideal before committing or reviewing.

🔒100% private

Your XML is formatted locally in JavaScript; nothing is logged, stored, or sent to a server.

🆓Free, no signup

Unlimited formatting with no account or quota, on desktop and mobile.

Popular Use Cases

Code review & diffs

  • Make minified XML readable
  • Get clean line-by-line diffs
  • Spot structure at a glance

Where XML is used

  • SOAP & enterprise APIs
  • config & build files
  • RSS/Atom feeds

Debugging

  • Un-minify third-party XML
  • Trace a rule or statement
  • Understand generated output

What It Handles

Structure

  • Nesting & blocks
  • Comments preserved
  • Whitespace normalised

Output

  • Consistent indentation
  • Readable line breaks
  • Copy or download

Workflow

  • Load an example
  • Re-format any input
  • Runs offline after load

Sources & References

Frequently Asked Questions

How do I format XML online?

Paste your XML into the input box and click Format. The formatter runs instantly in your browser and shows the result on the right — no upload, no signup, no installation.

Is this XML formatter free?

Yes. The XML formatter is completely free with no limits, no account, and no watermark. All processing happens locally in your browser for privacy.

Is my XML sent to a server?

No. Your XML never leaves your device — it is processed locally in JavaScript. We don't upload, log, or store your input, so it's safe for proprietary code and config.

Does formatting change how my XML works?

No. Formatting only adds indentation and line breaks for readability; it does not change the meaning or behaviour of your XML.

Can I use the XML formatter on mobile?

Yes. The tool is fully responsive and works on phones, tablets, and desktops — just open it in any modern browser.

🎓 Pro Tips

  • Tip 1: Format XML right before committing so diffs show real changes, not whitespace noise.
  • Tip 2: Beautifying does not validate logic — pair it with a linter for XML to catch errors.
  • Tip 3: Authoritative reference: W3C XML 1.0 — https://www.w3.org/TR/xml/.