XML Minifier / Validator
Minify XML by removing whitespace, or validate XML syntax. Paste your XML and choose an operation. Minify for transit or validate for correctness — free, local, no signup.
How to Use the XML Minifier / Validator
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Frequently Asked Questions
What does minification remove?
Removes all unnecessary whitespace, line breaks, and indentation between elements and attributes. Comments and CDATA sections are preserved.
Does it validate XML?
Yes. The validator checks for well-formed XML: proper tag nesting, closed elements, valid attribute syntax, and correct entity references.
Can I choose between minify and validate?
Yes. Toggle between minification mode (reduce file size) and validation mode (check syntax) with a single click.
Does it handle XML declarations?
Yes. XML declarations (<?xml version='1.0'?>) and processing instructions are preserved during minification and validated for correct syntax.
Is my XML uploaded?
No. All minification and validation happens locally in your browser. No XML data is transmitted to any server.
What engine checks the XML?
The browser DOMParser in text/xml mode: both Minify and Validate first look for a parsererror node, so broken XML reports Invalid XML instead of minifying. Successful Minify only collapses inter-tag gaps to >< plus trim; Validate answers Valid XML. A 2-mode toggle switches between them.
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Last updated October 2026