XML Formatter Online - XML Viewer, Validator & Pretty Print Tool

What is XML Formatter & Validator?

XML Formatter converts hard-to-read XML strings into a readable, indented format (Pretty Print), or compresses them by removing unnecessary whitespace (Minify). It automatically validates whether XML is well-formed during formatting and minifying, displaying errors with line and column numbers. CDATA sections, comments, and processing instructions are preserved as-is. Indent style can be selected from 2 spaces, 4 spaces, or tab. All processing happens entirely in your browser, so even XML containing sensitive data can be formatted safely.

See also: XML to JSON · JSON to XML

How to Use

1. Paste your XML into the left text area
2. Select indent size (2 spaces / 4 spaces / tab)
3. Click 'Format' or 'Minify' button
4. The result appears on the right. Use the copy button to copy to clipboard

Usage Examples

Input (Minified XML):
<root><user id="1"><name>Alice</name><age>30</age></user></root>

After formatting (2 spaces):
<root>
  <user id="1">
    <name>Alice</name>
    <age>30</age>
  </user>
</root>

Practical use: Copy an API XML response, paste it into this tool, and format it to inspect the XML structure

FAQ

Is my data sent to a server?

No. All processing happens in your browser, so your XML data is never transmitted externally.

What kind of syntax errors can it detect?

It performs well-formed XML checks. It detects unclosed tags, missing attribute quotes, invalid characters, and more. Schema validation (XSD/DTD) is not supported.

Are CDATA sections and comments preserved?

Yes. CDATA sections, comments (<!-- ... -->), and processing instructions (<?...?>) are preserved as-is.

Is the XML declaration (<?xml ...?>) preserved?

Yes. If the input contains an XML declaration, it is preserved in the output.

Can I change the indent size?

Yes. You can choose from 2 spaces, 4 spaces, or tab.

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