XML Compare — Diff Two XML Files Online

Compare two XML documents side by side. Highlights added, removed, and changed values. Deep structural diff. Free, private, and browser-based.

About XML Compare — Diff Two XML Files Online

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This free online XML compare tool parses two XML documents using fast-xml-parser and shows a side-by-side diff with added lines in green and removed lines in red. Both documents are normalised before comparison — whitespace differences and indentation variations are ignored — so only meaningful content changes are flagged. A deep structural diff then compares the parsed document trees recursively, identifying which elements were added, removed, or changed at any nesting depth. Use it to compare API responses before and after a change, audit XSLT transformation output, or verify that reformatted XML is semantically identical. Your data never leaves your browser.

Key Features

  • Side-by-side XML diff with green additions and red removals
  • Normalises whitespace and indentation before comparison to reduce false positives
  • Deep structural diff using fast-xml-parser — compares element trees recursively
  • Identifies added elements, removed elements, and changed attribute or text values
  • Handles large XML files and deeply nested element structures
  • Your XML is never uploaded — all processing runs in your browser

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