XML Formatter, Minifier & Validator

Free online XML formatter, minifier and validator. Paste XML for instant pretty-print, minification or well-formedness validation. Configurable indentation (2/4/Tab), attribute sorting, and empty element collapsing. All processing happens locally in your browser, no data is uploaded.

Key Features

• Format (Pretty-Print): Turn compressed or messy XML into clean, indented structure with one click
• Minify: Strip all whitespace and line breaks, compressing XML to a single line for smaller file size
• Validate: Real-time well-formedness checking with precise line and column numbers
• Smart Fix Suggestions: One-click fixes for unclosed tags, missing attribute quotes, illegal characters, and more
• Configurable Options: Indent size (2/4/Tab), sort attributes alphabetically, collapse empty elements
• Drag & Drop Import: Drop XML files directly into the editor area
• Copy & Download: Independent copy and download for both input and output
• Dual-Panel Layout: Edit on the left, view results on the right with formatted output and validation report tabs

How to Use

1. Paste or type XML in the left panel, or drag and drop an XML file onto the editor
2. Adjust options: indent size, attribute sorting, empty element collapsing
3. Click “Format” to prettify, “Minify” to compress, or “Validate” to check syntax
4. View results or validation report in the right panel
5. Copy or download your result

Use Cases

• Development debugging: inspect API XML responses and SOAP messages
• Configuration files: format Spring, Android Layout, Maven and other XML configs
• Data exchange: minify XML to reduce transfer size
• Data processing: efficient conversion between XML and readable text

Technical Notes

• Powered by the MIT-licensed fast-xml-parser library, all parsing happens client-side
• Your data never leaves your browser — fully local, fully private
• Supports XML declarations, CDATA sections, comments, namespaces and more

Last verified: 2026-07-25