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XML Formatter

XML Formatter parses XML text and reindents its element structure; malformed XML is reported instead of being silently repaired. Essential for developers cleaning minified XML, reviewing SOAP payloads, and preparing XML for readable diffs in version control.

XML tools

In brief

XML Formatter parses XML text and reindents its element structure; malformed XML is reported instead of being silently repaired.

What this tool supports

  • Formats raw and minified XML
  • Configurable indentation (spaces or tabs)
  • Proper tag alignment and nesting
  • Handles self-closing and empty elements
  • Preserves XML declarations and CDATA
  • Consistent attribute formatting
  • Preserves all content and comments
  • One-click copy to clipboard
  • Download as .xml file
  • Works completely offline in your browser

How to Use XML Formatter

Transform your raw or minified XML into clean, properly indented, and human-readable markup.

  1. 1

    Step 1

    Open the XML Formatter tool

    Navigate to the XML Formatter from the tool registry. The interface presents an input area for your XML content along with formatting options for indentation and spacing.

  2. 2

    Step 2

    Paste your XML content

    Copy your raw, minified, or unformatted XML and paste it into the input area. The tool parses the XML structure and prepares it for formatting with proper indentation.

  3. 3

    Step 3

    Select indentation style

    Choose your preferred indentation style from the available options. Select between 2 spaces, 4 spaces, or tabs based on your project standards and team preferences.

  4. 4

    Step 4

    Click Format

    Press the Format button to execute the formatting. The tool applies consistent indentation to all elements, aligns opening and closing tags, and structures attributes for optimal readability.

  5. 5

    Step 5

    Review the formatted output

    Examine the formatted XML in the output area. Verify that the indentation is consistent, tags are properly aligned, and all content is preserved before copying or downloading.

  6. 6

    Step 6

    Copy or download the XML

    Use the copy button to place the formatted XML on your clipboard for pasting into an editor or version control, or click the download button to save as a .xml file.

Common mistakes

Using malformed or incomplete input

Consequence: The parser cannot produce a trustworthy result.

Fix: Start with a known-good vector such as valid input.

Treating transformed output as a security guarantee

Consequence: Readable or reversible data may be trusted incorrectly.

Fix: Review the result before using it in a production, security, or data-loss-sensitive workflow.

Choosing the wrong format, algorithm, unit, or variant

Consequence: Another system may reject or misinterpret the result.

Fix: Confirm the receiver follows Unicode Standard.

Skipping output verification

Consequence: Truncation, invalid syntax, or lossy changes can reach production.

Fix: Compare with reviewed local output and round-trip when possible.

Processing an unnecessarily large input at once

Consequence: The tab may become slow or run out of memory.

Fix: Very large inputs can pause the browser tab during parsing, rendering, copying, or conversion.

Copying stale output after changing input

Consequence: The saved result no longer represents the source.

Fix: Run again and review status before copying or downloading.

Best practices

  • Keep a known test vector such as valid input.
  • Check behavior against Unicode Standard.
  • Review the result before using it in a production, security, or data-loss-sensitive workflow.
  • Round-trip reversible transformations.
  • Keep the original source until review is complete.
  • Use the smallest practical input and close unused large-file tabs.

Connected workflows

Prepare and process

XML Formatter

XML Formatter parses XML text and reindents its element structure; malformed XML is reported instead of being silently repaired.

  1. Use supported input
  2. Choose relevant options
  3. Run locally
  4. Review diagnostics

Verify before integration

XML Formatter

Validate reviewed local output before another application uses it.

  1. Run locally
  2. Verify the result
  3. Copy, download, or continue

Continue through the tool family

XML Formatter

Move the reviewed result into a related local workflow.

  1. Verify the result
  2. Copy, download, or continue

Browser limitations

  • Very large inputs can pause the browser tab during parsing, rendering, copying, or conversion.
  • Clipboard, camera, downloads, and local files can require a secure context or explicit browser permission.
  • Available memory varies by device, and mobile systems may reclaim background tabs.

Authoritative resources

W3C XML SpecificationPublisher: w3.org · Reviewed: 2026-07-07XML.orgPublisher: xml.org · Reviewed: 2026-07-07XML Formatter OnlinePublisher: xmlformatter.org · Reviewed: 2026-07-07Unicode StandardPublisher: unicode.org · Reviewed: 2026-07-07

Concrete examples

Input
valid input
Result
reviewed local output

This example verifies XML Formatter's primary behavior without uploading data.

Frequently asked questions

What is XML Formatter?

XML Formatter takes your raw or minified XML content and applies proper indentation, line breaks, and spacing to produce a clean, human-readable output. It automatically aligns opening and closing tags, structures attributes consistently, and makes complex XML documents easy to navigate and understand.

Does XML Formatter upload my data?

No. The entire formatting process runs locally within your browser. Your XML data is never transmitted to any external server, ensuring complete privacy and security of your information throughout the formatting operation.

How do I format XML?

Paste your raw or minified XML into the input area and click Format. The tool parses the XML structure, applies consistent indentation using spaces or tabs, and displays the formatted output ready for copying or downloading.

What indentation options are available?

The tool offers flexible indentation options including space-based indentation (2 or 4 spaces) and tab-based indentation. You can choose the option that best matches your project coding standards or team preferences.

Does it handle self-closing tags?

Yes. The formatter correctly handles self-closing XML tags such as <br/>, <img/>, or custom empty elements. It preserves the self-closing syntax while applying proper indentation and alignment to these elements.

Can I format XML with attributes?

Yes. The formatter properly handles XML elements with attributes, maintaining consistent formatting for attribute placement and alignment. Attributes are formatted according to standard XML conventions for readability.

Can I copy the formatted output?

Yes. After formatting, you can copy the entire formatted XML to your clipboard using the copy button. You can also download the result as a .xml file for immediate use in your projects or documentation.

Does it preserve XML content?

Yes. All XML content, text nodes, CDATA sections, comments, and processing instructions are preserved exactly as they appear in the original input. Only whitespace and indentation are modified for readability.

Does it handle XML declarations?

Yes. The formatter correctly preserves XML declarations such as <?xml version="1.0" encoding="UTF-8"?> at the beginning of the document, maintaining proper placement and formatting of the declaration line.

Does it work offline?

Yes. Once the page loads, all formatting operations happen locally in your browser without any network dependency. It works reliably in offline or restricted network environments.

Privacy and offline behavior

XML Formatter processes input and produces output inside this browser. The tool does not upload tool data. Browser capabilities such as files, clipboard, camera, Canvas, Web Crypto, workers, or downloads are used only after the workflow or an explicit user action requires them.