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XML Formatter/Validator

Free online XML formatter and validator. Beautify, minify, and validate XML instantly with detailed error reporting.

Updated

What is the XML Formatter/Validator?

Our free online XML Formatter & Validator helps you instantly beautify, minify, and validate your XML code. Whether you need to pretty-print complex XML for readability, detect syntax errors with precise line and column information, or compress markup for production, this tool has you covered.

Key Features:

  • Instant Formatting – Indent XML with spaces or tabs, sort attributes, and preserve declarations.
  • Precise Validation – Catch missing tags, mismatched names, and unclosed quotes with detailed error locations.
  • Smart Minification – Remove all unnecessary whitespace while keeping your document valid.
  • Document Statistics – View element count, nesting depth, attribute count, file size, and more.
  • No Installation Required – Works entirely in your browser, no data leaves your machine.

Perfect for developers, QA engineers, and anyone working with XML configuration files, API responses, or data interchange formats.

How it works

  1. Paste or type your XML into the input area. You can also click Load Sample to try a demo document.
  2. The tool automatically processes your input (you can disable auto-process if you prefer). It validates the XML structure instantly.
  3. Choose your mode:
  • Format – Select indentation (2, 4, 8 spaces or tabs), optionally enable attribute sorting for consistent order.
  • Minify – Compress your XML into a single line, removing all non-essential whitespace.
  1. Review the output in the code pane with line numbers. Any validation errors are displayed with exact line and column positions.
  2. Analyze document statistics like element count, nesting depth, and file size.
  3. Copy the formatted or minified code to your clipboard or download it as an .xml file.

No data is ever sent to a server; all processing happens locally in your browser for privacy and speed.

Examples

Basic XML formatting

A simple XML snippet formatted with 2‑space indentation.

<?xml version="1.0"?><root><item id="1">Hello</item></root>
<?xml version="1.0"?>
<root>
  <item id="1">Hello</item>
</root>

Frequently asked questions

Is this XML formatter really free?

Yes, our XML formatter and validator is completely free with no usage limits. You can format, minify, and validate XML as many times as you need without signing up or paying.

Does the tool store my XML data?

No. All processing is done locally in your browser. Your XML code never leaves your device, ensuring complete privacy and security.

What kind of errors can the validator detect?

The validator catches common XML issues such as missing closing tags, mismatched tag names, unclosed quotes in attributes, invalid tag names, and unclosed CDATA sections or comments. Each error includes the exact line and column number for quick fixing.

Can I sort attributes alphabetically?

Yes. When formatting, enable the “Sort attributes” checkbox to reorder attributes within each element alphabetically. This is useful for standardizing XML files that may have inconsistent attribute order.

How does minification work?

Minification removes all unnecessary whitespace (spaces, tabs, newlines) that are not part of text content. It keeps the document well‑formed and ideal for production, reducing file size without changing structure.

Does the tool support XML with namespaces?

Yes, the formatter and validator handle XML namespaces and prefixed tags correctly. Validation works regardless of namespace prefixes.

Can I download the formatted XML?

Absolutely. After processing, click the “Download .xml” button to save the result as a file. You can also copy it to your clipboard with one click.

Is there a limit on file size?

The tool runs entirely in your browser, so the practical limit depends on your device’s memory and performance. For very large XML files (e.g., over 10 MB), processing may be slower, but there is no hardcoded limit.

What’s the difference between formatting and validating?

Formatting reformats your XML with proper indentation and line breaks for readability. Validation checks if the XML is well‑formed (correct syntax) and reports structural errors. Our tool combines both, but you can still format invalid XML—the validator will show you exactly what’s wrong.

Why does the auto‑process checkbox exist?

Auto‑process updates the output as you type, which is great for quick feedback. If you’re working with very large documents, disabling it lets you manually trigger processing with the “Process XML” button to avoid lag.

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