XML Diff Checker — Compare XML & HTML Online
Paste two XML or HTML documents and instantly see every added element, changed attribute, and removed tag. Syntax highlighting included. No account. No limits.
Paste text in both panels above to compare
Or to see how it works
Compare XML API responses
When debugging XML APIs or SOAP services, paste two responses side by side to see exactly what changed — added elements, removed nodes, changed attribute values, or modified text content. The diff makes it immediately clear what your XML API returned differently between two calls.
Diff XML configuration files
Many applications use XML for configuration: web.config, pom.xml, AndroidManifest.xml, Spring beans, and more. Paste the old and new config to quickly understand what settings changed between versions or environments.
HTML diff for templates and markup
Compare two HTML snippets or full page templates to see which elements were added, which were removed, and which attributes changed. Useful for reviewing email template changes, diffing component markup, or comparing rendered output from two versions of a page.
XML/HTML syntax highlighting
Unlike plain text diff tools, DiffCheck applies XML/HTML syntax coloring on top of the diff highlighting. Tags, attributes, attribute values, and text content are color-coded, making it much easier to visually scan complex XML structures at a glance.
Privacy-first — runs in your browser
XML payloads often carry sensitive data: SOAP messages, internal schemas, configuration secrets, or private API responses. DiffCheck never sends your XML to any server. All comparison logic runs locally in JavaScript — safe for production payloads, internal configs, and any private XML documents.
Character-level attribute diffs
When an XML attribute value changes — a URL updates, a version number bumps, or an ID changes — DiffCheck highlights the exact characters that changed within the attribute value, not just the whole line. Spot a single digit change or a path segment update instantly without reading the whole element.
How to compare XML online
- 1
Paste your original XML
Put the first XML or HTML document in the left editor — this is your baseline. Works with any valid XML: API responses, config files, SOAP envelopes, HTML templates.
- 2
Paste your modified XML
Put the second XML document in the right editor. This is what you're comparing against the original — the updated version, the response from a different environment, or the proposed change.
- 3
Read the diff
Green lines were added; red lines were removed. Within changed lines, the exact characters that differ are highlighted more intensely. XML/HTML is selected by default for syntax coloring.
- 4
Switch views as needed
Use side-by-side view to see both XML documents in parallel columns, or switch to inline view for a compact change summary. The statistics bar shows total lines added, removed, and unchanged.
Frequently asked questions
What is an XML diff checker?
An XML diff checker compares two XML documents and highlights the differences — added elements, removed tags, changed attribute values, and modified text content. It makes it easy to review XML schema changes, compare API responses, or spot differences between configuration files.
Can I use this to compare HTML files?
Yes. The tool works for both XML and HTML. Paste two HTML snippets or full HTML documents to see exactly which tags, attributes, and text content changed. Syntax highlighting is applied to both XML and HTML.
Is this XML diff tool free?
Yes, completely free with no rate limits and no signup. All XML comparison runs in your browser — your data never leaves your device.
Is my XML data safe to paste here?
Yes. All diff computation runs locally in your browser using JavaScript. Your XML is never sent to any server, never stored, and never logged. Safe to use with SOAP envelopes, internal XML schemas, or any sensitive XML payloads.
Can I compare SOAP request and response XML?
Yes. Paste two SOAP envelopes into the editors to immediately see what changed between requests or responses — updated element values, added headers, or modified namespaces. Character-level highlighting shows the exact characters that changed within each element.
Does formatting matter when comparing XML?
The tool compares line by line, so indentation differences will show as changes. For the most meaningful diff, make sure both XML documents are formatted consistently — either both pretty-printed with the same indentation, or both compact/minified.