XML Formatter — Beautify, Minify and Validate XML Online

XML Formatter — Beautify, Minify & Validate XML

XML Formatter is an online tool that beautifies, minifies, and validates XML documents right in your browser. Paste a messy single-line file and it returns clean, indented code with syntax highlighting and an interactive tree view.

It works with any well-formed XML — configuration files, SOAP messages, RSS and Atom feeds, SVG graphics, XSLT stylesheets, and XSD schemas — so developers, data analysts, and anyone reading XML-based formats can quickly tidy up and verify their data.

Private by design: all formatting and validation runs locally in your browser. Your XML is never uploaded to a server, so it is safe to use with sensitive or confidential documents.

How to Format XML

Add your XML

Paste your XML into the input panel on the left, or use Upload File to load a document from your device. Try Sample Data to see the tool in action with example XML.

Choose Format or Minify

Pick Format to beautify with clean indentation, or Minify to strip whitespace into a single compact line. In Format mode, set the indent size to 2, 4, or 8 spaces.

Review the output

The result appears on the right. Switch between the Code view with syntax highlighting and the Tree view to explore the structure. The status bar reports whether the XML is valid plus its line, size, and element counts.

Copy or download

Use Copy to send the formatted XML to your clipboard, or Download to save it as an .xml file. Clear resets the editor when you are done.

Features

Beautify with Custom Indent

Format XML with 2, 4, or 8 spaces of indentation, handling elements, attributes, text, comments, and CDATA sections correctly.

Minify XML

Strip unnecessary whitespace to produce a compact single-line document, ideal for smaller files and production use.

Real-Time Validation

Your XML is checked for well-formedness as you type. Errors show the exact line and column, with the offending line highlighted.

Syntax Highlighting

Color-coded code view distinguishes tags, attribute names, values, comments, CDATA sections, and the XML declaration.

Interactive Tree View

Explore the document as a collapsible tree. Each element shows its tag, attributes, and child count, with badges for text, comment, and CDATA nodes.

Upload & Download Files

Load XML-based files such as .xml, .svg, .xsl, .xslt, .xsd, and .rss, then download the formatted result as an XML file.

Copy & Sample Data

Copy the formatted output to your clipboard with one click, or load built-in sample XML to test the tool instantly.

Editor with Line Numbers

The input editor includes scroll-synced line numbers and Tab support that inserts spaces matching your chosen indent size.

Status Bar Stats

A live status bar reports the validity state along with the line count, file size, and total number of elements.

Runs in Your Browser

Every step happens locally on your device. Nothing is sent to a server, keeping your XML data fully private.

Frequently Asked Questions

How do I format XML online?

Paste your XML into the input panel and keep Format selected. The tool beautifies it instantly with clean indentation in the output panel — no install or sign-up needed. Use Copy or Download to save the result.

How do I indent or prettify an XML file?

Load the file with Upload File or paste its contents, then choose an indent size of 2, 4, or 8 spaces. The formatter re-indents the whole document so nested elements line up and become easy to read.

Does formatting validate the XML too?

Yes. As you type, the tool checks that your XML is well-formed and shows Valid XML or Invalid XML in the status bar. If something is wrong, you get a message with the exact line and column, and that line is highlighted in the editor.

What does "Invalid XML" mean?

It means your XML is not well-formed. Common causes are missing closing tags, mismatched tag names, an unescaped & (use &), or a missing root element. The error message points to the location of the problem so you can fix it.

What XML formats and file types are supported?

Any well-formed XML works, including SOAP, RSS and Atom feeds, SVG, XSLT, and XSD schemas. The upload button accepts files with extensions such as .xml, .svg, .xsl, .xslt, .xsd, .rss, .atom, .wsdl, and .txt.

Does the tool change my XML content?

No. Formatting only adjusts whitespace and indentation. Your element names, attributes, text, comments, and CDATA sections stay exactly as they are. Minify removes whitespace between tags but preserves all of the actual content.

Is my XML data uploaded to a server?

No. All parsing, formatting, and validation happen entirely in your browser using JavaScript. Your XML never leaves your device, so it is safe to use with private or confidential documents.