Compare XML Online
Paste two XML documents below and find differences instantly.
About XML Compare Online
Compare two XML files side by side. Find differences in XML structure, attributes, and values. Free XML diff tool. All processing happens in your browser — nothing is uploaded to any server. Completely free, no sign-up required.
XML remains one of the most widely used data formats in enterprise software, web services, and document management systems. Our XML comparison tool helps developers, system integrators, and technical writers identify changes between two XML documents with precision. Whether you are comparing SOAP API responses, reviewing changes to Maven POM files, auditing Spring configuration updates, or validating XSLT transformation outputs, this tool highlights every difference in elements, attributes, text content, and document structure. It handles XML declarations, processing instructions, CDATA sections, and comments — giving you complete visibility into what has changed.
Working with XML often involves complex namespace declarations, deeply nested element hierarchies, and extensive attribute lists that make manual comparison extremely tedious and error-prone. Our side-by-side diff view clearly marks additions in green and removals in red, allowing you to scan through even lengthy XML documents efficiently. The tool is particularly useful for comparing configuration files in Java applications (web.xml, persistence.xml, pom.xml), validating data feeds in RSS/Atom format, checking SVG image source code changes, reviewing XHTML document edits, and comparing XML schema (XSD) definitions across versions.
For best results when comparing XML documents, ensure consistent formatting before pasting — use the same indentation level (2 or 4 spaces) and place each attribute on a predictable line. If your XML contains namespace prefixes, keep them consistent between both versions to avoid false positives in the diff output. This tool processes everything client-side, meaning your XML data containing sensitive business rules, proprietary schemas, or confidential configurations never leaves your browser. It is ideal for regulated industries like healthcare (HL7/CDA documents), finance (FIX/FIXML messages), and government (NIEM data exchanges) where data privacy is paramount.
Frequently Asked Questions
How does the XML compare tool handle namespaces?
The tool performs a text-based line diff comparison, so XML namespaces are compared as part of the text content. If two documents use different namespace prefixes for the same URI (e.g., ns1:element vs ns2:element), these will show as differences. For the most accurate comparison, ensure both XML documents use consistent namespace prefixes. The tool will highlight any changes in namespace declarations, prefixed element names, and xmlns attributes.
Can I compare XML files with different attribute ordering?
Yes, but be aware that different attribute orders on the same element will appear as changes in the diff output. While XML specification states that attribute order is insignificant, our text-based comparison treats them as textual differences. To minimize noise, consider normalizing attribute order in both documents before comparing. This is especially relevant for machine-generated XML where attribute order may vary between runs.
Does the tool support comparing formatted vs minified XML?
The tool compares XML exactly as you paste it. If one document is minified (single line) and the other is formatted (pretty-printed), virtually every line will show as different. For meaningful comparisons, format both XML documents with the same indentation style first. You can use any XML formatter or pretty-printer to normalize whitespace before pasting into the comparison tool.
What types of XML files can I compare with this tool?
You can compare any valid or even malformed XML content, including configuration files (web.xml, pom.xml, .csproj), data interchange formats (SOAP messages, RSS feeds), document formats (XHTML, DocBook, DITA), schema definitions (XSD, WSDL), vector graphics (SVG), and any other XML-based format. The tool works with XML of any size that your browser can handle, typically up to several megabytes.
Is it safe to compare XML containing sensitive data?
Absolutely. All XML comparison processing occurs entirely within your web browser. No data is uploaded to any server or stored anywhere externally. This makes the tool completely safe for comparing XML documents containing sensitive information such as authentication credentials, patient health records (HL7/CDA), financial transaction data (FIXML), or proprietary business configurations. Your data stays on your machine at all times.