Compare two XML files side-by-side and instantly see every difference. This free XML diff tool provides syntax highlighting, auto-formatting with Prettier, and color-coded diffs. Perfect for comparing configuration files, SOAP responses, SVG files, RSS feeds, or any XML data. viewdiff runs 100% in your browser — your XML documents are never uploaded to any server.
Features
XML syntax highlighting for tags, attributes, and values
Auto-format and pretty-print XML with Prettier
Side-by-side and inline diff views
Handles large XML documents efficiently
Tag-aware coloring and namespace support
Compare config files, SOAP, SVG, RSS, and more
Share XML diff via URL
100% client-side — your XML stays private
Frequently asked questions
How do I compare two XML files online?
Paste the original XML on the left and the modified XML on the right. viewdiff instantly highlights every difference — added elements in green, removed elements in red. No buttons to click, no sign-up needed.
Does it format XML before comparing?
Yes — click Format to auto-indent and pretty-print your XML with Prettier before comparing. This normalizes formatting so you only see meaningful differences.
Can I compare SOAP responses?
Yes. Paste any valid XML including SOAP responses, WSDL files, SVG markup, RSS feeds, Maven POM files, and configuration files.
Does it handle XML namespaces?
Yes — the syntax highlighter and diff engine handle namespaced XML, namespace prefixes, and xmlns declarations correctly.
Can I compare large XML files?
Yes. viewdiff uses the Monaco editor (same engine as VS Code) which handles large documents efficiently with virtualized rendering.
Is my XML data private?
Yes — viewdiff runs 100% client-side in your browser. Your XML documents are never uploaded to any server. Safe for comparing sensitive configuration files.
Can I ignore whitespace in XML comparisons?
Yes — use the Format button to normalize indentation, or toggle "Ignore whitespace" in Settings to hide formatting-only differences.
Is this XML diff tool free?
Yes, completely free with no ads, no account required, and no usage limits. Compare as many XML files as you want.