Left
Paste or edit XML here (source)
Right
Formatted output (also editable)
Validation details
Showing the last validate/format result for Left (source)
No validation errors
Click Validate & Format to re-check the current source pane.
XML Formatter
Validate XML, pretty-print it, and format it — entirely in your browser.
Keep keys as-is
XML Formatter Features
Our free online XML formatter and validator provides everything you need to work with XML data. Whether you're a developer, data analyst, or just need to format XML for readability, our tool makes it easy.
- ✓XML validation with detailed error reporting
- ✓XML formatting and pretty printing with customizable indentation
- ✓Element and attribute name case conversion (camelCase, PascalCase, snake_case)
- ✓Side-by-side diff viewer to compare original and formatted XML
- ✓File upload and download support
- ✓Works entirely in browser - no data uploaded to servers
- ✓Real-time syntax highlighting
- ✓Copy to clipboard functionality
Common Use Cases
API Development
Format and validate XML responses from APIs to ensure proper structure and catch errors early in development.
Data Analysis
Make large XML files readable by formatting them with proper indentation, making it easier to analyze data structures.
Code Migration
Convert key names between different naming conventions (camelCase, PascalCase, snake_case) when migrating between systems or frameworks.
Debugging
Use our detailed error reporting to quickly identify and fix syntax errors in XML files, with line and column numbers for precise error location.
Frequently Asked Questions
What is an XML formatter?
An XML formatter is an online tool that validates, formats, and beautifies XML (eXtensible Markup Language) data. It helps developers make XML code more readable by adding proper indentation, line breaks, and structure. Our XML formatter also validates syntax and can convert element and attribute names to different casing styles.
How do I format XML online?
Simply paste your XML code into the left editor, click 'Validate & Format', and the formatted XML will appear in the right panel. You can also upload an XML file, adjust indentation (2 spaces, 4 spaces, or tabs), and convert element/attribute names to different casing formats. The tool works entirely in your browser.
Can I validate XML syntax?
Yes! Our XML validator checks your code for syntax errors and provides detailed error messages including the exact line and column where issues occur. It uses the browser's built-in XML parser to ensure accurate validation.
Can I convert XML element names to camelCase, PascalCase, or snake_case?
Yes! Our XML formatter includes a key case converter for both element names and attribute names. You can transform all XML tags to camelCase, PascalCase, or snake_case to match different coding conventions or API requirements.
Is my XML data secure?
Absolutely. Our XML formatter runs entirely in your browser using client-side JavaScript. No data is sent to any server - everything is processed locally on your device. Your sensitive XML data never leaves your computer.
What's the difference between XML and JSON formatting?
XML uses tags and attributes (e.g., <user name='John'>), while JSON uses key-value pairs (e.g., {"name": "John"}). Both formats can be formatted and validated using our tools. We support both JSON and XML formatters on separate pages.