<div class="nfaf-generated-content"><div class="nfaf-visual-card" style="--nfaf-accent:#7c0d25"><div class="nfaf-visual-icon" aria-hidden="true"><svg viewBox="0 0 64 64" role="img"><circle cx="32" cy="32" r="28" fill="currentColor" opacity=".12"></circle><path d="M20 34l8 8 17-19" fill="none" stroke="currentColor" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"></path></svg></div><div><strong>XML Formatter and Validator</strong><span>Browser-first utility with visible inputs, outputs, and limitations.</span></div></div><p class="nfaf-lede">This tool gives a quick browser-based check for well-formed XML and formats a small document so nested elements and attributes are easier to inspect.</p><p><strong>Designed for:</strong> Developers, QA testers, and technical writers inspecting small XML fixtures or configuration files.</p><h2>How to use this tool</h2><p>Paste XML and choose the indentation width. The browser parser reports a parser error when it cannot read the document; valid XML is serialized and formatted for review.</p><h2>How the result is produced</h2><p>The tool uses the browser DOMParser with the application/xml MIME type and XMLSerializer for output. Formatting is a readability pass, not a schema validation step.</p><h2>Test examples</h2><p><items><item id="1">One</item></items> is well-formed and can be displayed with nested indentation. An unclosed element such as <item>One produces a parser error.</p><h2>Limitations</h2><p>Well-formed XML is not the same as valid XML for a particular XSD, DTD, API, or application. Namespace behavior, external entities, very large documents, and dialect-specific rules need a standards-aware workflow.</p><h2>Privacy and processing</h2><p>The XML is parsed and formatted in the browser. It is not uploaded by this tool.</p><h2>Related guide</h2><p><a href="https://nofyi.com/well-formed-xml-versus-schema-valid-xml/">Well-formed XML versus schema-valid XML</a></p><h2>Related tools in this category</h2><ul class="nfaf-related-tools"><li><a href="https://nofyi.com/tools/json-formatter/">JSON Formatter and Validator</a><span>Paste a JSON object or array, then format it or validate its syntax.</span></li><li><a href="https://nofyi.com/tools/base64-encoder-decoder/">Base64 Encoder and Decoder</a><span>Choose encode or decode. The browser performs the conversion locally.</span></li><li><a href="https://nofyi.com/tools/timestamp-converter/">Unix Timestamp Converter</a><span>Convert a date-time to Unix seconds or convert seconds back to an ISO-style date.</span></li></ul><h2>Documentation</h2><ul><li><a href="https://developer.mozilla.org/en-US/docs/Web/API/DOMParser" rel="nofollow noopener" target="_blank">https://developer.mozilla.org/en-US/docs/Web/API/DOMParser</a></li><li><a href="https://www.w3.org/TR/xml/" rel="nofollow noopener" target="_blank">https://www.w3.org/TR/xml/</a></li></ul><p class="nfaf-disclosure">This page describes the implementation shipped with the NOFYI Tool Factory. Review the interface output before using it in a production workflow.</p></div><div class="nfaf-app-slot">[nfaf_tool_app]</div>
