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Developer Last Updated: August 10, 2026

XML Formatter & Syntax Validator

Format, beautify, validate syntax, and clean up complex XML documents online for free.

100% Client-Side Privacy Guarantee

Your data is processed completely within your local web browser. Absolutely nothing is uploaded to our servers, keeping your information private, anonymous, and mathematically secure.

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Was this tool helpful?

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What This Tool Does

XML document structures rely on strict closing tags and hierarchy indentation. Mismatched tags or unindented XML feeds cause parser errors.

Our XML Formatter & Validator formats raw XML data into clean indented node trees and validates syntax correctness.

How to use

  • 1Step 1: Paste raw XML string into input box.
  • 2Step 2: Click 'Format XML' or 'Validate XML'.
  • 3Step 3: Copy clean XML output or inspect syntax error line messages.

Example Scenarios

Use Case 1:API Payload Inspection: Format SOAP API or RSS XML feeds.

Use Case 2:Config File Editing: Clean up Android Manifests or pom.xml files.

Why It's Useful

Strict DOM Parser: Accurately catches unclosed tags.
100% Client-Side Privacy: Your XML files stay local.

Tips for Best Results

Ensure your XML string has a single root wrapping tag.

Frequently Asked Questions

How does it detect XML syntax errors?

It uses browser DOMParser APIs to validate XML schema rules and flags exact line numbers for mismatched or unclosed tags.

Is my XML file uploaded to a server?

No. XML parsing and formatting run 100% client-side.

AdSense Compliant

Free tool, no signup required. Ads are labeled and separated to keep the tool area clean and safe.