XML Formatter & Validator - Free Online Tool

Format, validate, and prettify XML data instantly. Syntax highlighting and error detection included.

Input XML

Formatted XML

Your formatted XML will appear here...

How to use the XML Formatter:

🎨 Format & Prettify

Makes your XML readable with proper indentation and line breaks. Perfect for debugging and reviewing XML data.

🗜️ Minify

Removes all unnecessary whitespace to reduce file size. Ideal for production environments and API responses.

✅ Validate

Checks your XML syntax for errors and provides detailed error messages for easy debugging.

What is an XML Formatter?

An XML formatter is a utility that reformats XML by adding consistent indentation and line breaks, making data easier to read and debug. This tool also validates XML syntax and can minify XML for production by removing unnecessary whitespace.

Key Features

  • Prettify with consistent indentation
  • Minify XML for smaller payloads
  • Instant validation with error details
  • Line numbers and code folding
  • Copy and download results

Common Use Cases

  • Debugging API/XML responses
  • Cleaning XML before code reviews
  • Reducing size for storage or transport
  • Validating config files and sitemaps
  • Teaching and documentation

How to Use

  1. Paste your XML in the left editor.
  2. Choose Format, Minify, or Validate.
  3. Copy or download the result from the right panel.

Frequently Asked Questions

Quick answers to common questions about the XML Formatter.

🛡️Is my XML data uploaded or stored?
No. Processing runs entirely in your browser using Web Workers. Your data never leaves your device.
🚀Are there size limits? Will it handle large XML?
Large inputs work, but very big files may be slower in the browser. If you hit slowness, try Minify first or paste smaller chunks.
✨What's the difference between prettify and minify?
Prettify optimizes readability with indentation and line breaks. Minify removes them to reduce size for faster network transfer.
🧩Does it support XML namespaces (xmlns)?
Yes. Formatting and validation work with namespaced elements and attributes.
📦Are CDATA and special characters preserved?
Yes. CDATA sections and entities (e.g., < &) are preserved during formatting and minification.
🐞Do you show the exact line/column for errors?
We surface parser errors. For extremely large inputs, exact pointers may vary based on the browser parser.
📥What encoding is used for downloaded files?
UTF‑8 XML with a proper MIME type. You can change the XML declaration manually if needed.
📱Does it work on mobile and support accessibility?
Yes. The UI is responsive with dark mode and keyboard/screen‑reader friendly controls.
❓Does the validator check against XSD?
This tool checks for well-formed XML syntax. XSD validation is not supported yet.