Minify XML Online — Free XML Compressor

Minify XML documents instantly — select, reorder, concatenate and minify multiple .xml files as one bundle with your current options. CDATA sections and processing instructions are preserved while everything stays in your browser.

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XML Minification
Minify XML online. Compress configs and feeds while preserving CDATA and processing instructions.

Features

Remove whitespace, comments and unnecessary formatting from XML documents to reduce file size while preserving CDATA sections and processing instructions.

Minify XML

Remove whitespace, comments and unnecessary formatting from XML documents to reduce file size while preserving CDATA sections and processing instructions.

Basic example

Input XML

<?xml version="1.0" encoding="UTF-8"?> <root> <item id="1"> <name>Product</name> <price>29.99</price> </item> <item id="2"> <name>Service</name> <price>49.99</price> </item> </root>

Minified XML

<?xml version="1.0" encoding="UTF-8"?><root><item id="1"><name>Product</name><price>29.99</price></item><item id="2"><name>Service</name><price>49.99</price></item></root>

Minification options

Remove Comments
Removes all XML comments (<!-- ... -->) from code

Comparison with/without option:

Original code
<root> <!-- This is a comment --> <item>Content</item> <!-- Another comment --> </root>
With removeComments: true
<root><item>Content</item></root>
With removeComments: false
<root><!-- This is a comment --><item>Content</item><!-- Another comment --></root>
Collapse Whitespace
Collapses multiple whitespace characters into single spaces and removes spaces between XML tags. Preserves CDATA sections and processing instructions.

Comparison with/without option:

Original code
<root> <item> Multiple spaces </item> <data> Text </data> </root>
With collapseWhitespace: true
<root><item> Multiple spaces </item><data> Text </data></root>
With collapseWhitespace: false
<root><item> Multiple spaces </item><data> Text </data></root>

See Beautify indentation options →

XML conversion helpers now have dedicated URLs

Use standalone flows for interoperability: jump to XML → JSON, XML → YAML or XML → CSV while keeping XML minification and beautification centered on FastMinify’s primary XML formatter.

XML Formatting and Beautification

Proper XML formatting makes documents easier to read, debug and maintain. Our formatter adds consistent indentation, aligns attributes, and organizes elements hierarchically. This is especially useful for configuration files (web.xml, pom.xml), SOAP responses, and XML data feeds.

Minifying XML Sitemaps

XML sitemaps can grow large for sites with thousands of pages. Minifying your sitemap.xml removes unnecessary whitespace and comments, reducing file size and improving crawl efficiency. Our tool handles sitemap-specific elements like loc, lastmod, changefreq and priority correctly.

Concatenating XML Files

On Minify XML, select or drop multiple .xml files, reorder them, then concatenate and minify the complete bundle once with your current options. Processing stays in your browser. Optional file markers, comments and extra spacing are added before minification and may be removed from the final output. Concatenating multiple full XML documents may leave duplicate &lt;?xml prologs or namespace collisions — review the bundle before deploy.

Frequently Asked Questions — Minify

Everything about minification

Why minify XML?

XML minification removes whitespace and comments while preserving CDATA sections and processing instructions.

Need to unminify XML?

Use our XML unminifier for audits and debugging.

Need to beautify XML?

Use our XML beautifier for consistent indentation.

How do I concatenate and minify multiple XML files?

On Minify XML, use the concat button or drop two or more .xml files on the input panel, reorder them, then concatenate and minify the complete bundle once with your current options. Everything runs in your browser. This workflow is not available on Beautify XML or Unminify XML. File markers and comments may be removed during minification. If you merge full XML documents, watch for duplicate &lt;?xml prologs and namespace collisions — review the output before deploy.

Verify it yourself

FastMinify processes your input in the browser. Inspect the network panel or read our validation gate to confirm nothing leaves your device.

Minify

Shrink code and assets for production — minify JavaScript, CSS, HTML, JSON and XML before gzip or CDN deploy.

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