Free Online XML Formatter and Validator
Pretty-print and validate XML documents with HubKit's XML formatter. Transform compressed or single-line XML into a well-structured, readable format with proper indentation. Ideal for working with SOAP APIs, RSS feeds, SVG files, configuration files, and any XML-based data.
How to Use
Paste your XML into the input pane. The formatter instantly adds proper indentation and line breaks to make the document structure clear. Validation errors are highlighted if the XML is malformed.
Features
- Pretty-print XML with consistent indentation
- Real-time XML validation with error reporting
- Handles CDATA sections, attributes, and namespaces
- Process XML locally — your data never leaves the browser
Frequently Asked Questions
Does the formatter handle XML namespaces?
Yes. The formatter preserves all XML namespaces, prefixes, and declarations while reformatting the document structure.
Can I validate XML against a schema?
The tool validates that your XML is well-formed (proper nesting, closed tags, etc.). For schema validation (XSD), a dedicated validator is recommended.
What is the maximum XML file size supported?
The tool handles XML documents up to several megabytes. Since processing happens in your browser, performance depends on your device.