XML Validator

Validate XML well-formedness in your browser with exact line and column error locations. Free, private, nothing leaves your machine.

XML inputpaste, type, or drop a file
Text output
Runs 100% in your browser. Nothing is uploaded, logged, or stored, and there are no ads. Verify it yourself: open your browser's Network tab while you convert and watch that no requests leave this page.

About this tool

Check that an XML document is well-formed: every tag closed, attributes quoted, exactly one root element. Problems are reported with their precise line and column.

This validates well-formedness, not schema conformance (no XSD/DTD checking), which is the check you need for 'why won't this parse' debugging.

Common uses

  • Find the unclosed tag in a large generated XML file.
  • Verify a hand-built SOAP envelope before sending it.
  • Check sitemap.xml or RSS feeds after editing.

Automate via API

The same conversion is available as a REST endpoint for scripts, pipelines, and backends:

curl -X POST https://payloadly.com/api/v1/tools/xml-validator \
  -H "Content-Type: text/plain" \
  -H "X-Api-Key: YOUR_API_KEY" \
  --data-binary @input.xml

API documentation · Get an API key

Worked examples

Real payloads from tools people use daily, with the exact output this converter produces. Every example runs in your browser, so you can load one and adapt it to your own data.

Validate a sitemap.xml

A malformed sitemap gets silently ignored by search engines; this confirms it is well-formed before you submit it.

XML input
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
  <url>
    <loc>https://example.com/</loc>
    <lastmod>2026-06-01</lastmod>
  </url>
  <url>
    <loc>https://example.com/pricing</loc>
  </url>
</urlset>
Text output
Valid XML.

Root value : object with 1 key
Input size : 217 B (9 lines)

Validate an RSS feed

Feed readers reject malformed XML outright; check an RSS feed is well-formed after hand-editing it.

XML input
<rss version="2.0">
  <channel>
    <title>Example Blog</title>
    <link>https://example.com</link>
    <item>
      <title>First post</title>
      <link>https://example.com/first</link>
    </item>
  </channel>
</rss>
Text output
Valid XML.

Root value : object with 1 key
Input size : 220 B (10 lines)

XML notes

XML remains entrenched in enterprise integrations, SOAP services, RSS/Atom feeds, and sitemaps. Unlike JSON, it distinguishes attributes from child elements and supports namespaces.

  • XML attributes are represented with an `@_` prefix when converted to JSON.
  • Repeated sibling elements become arrays; single elements become objects.
  • XML documents need exactly one root element.

Frequently asked questions

Is my data uploaded to a server?

No. This tool runs entirely in your browser using JavaScript, and there are no ads on the page. Nothing you paste or drop here is uploaded, logged, or stored, and you can verify that yourself: open your browser's developer tools and watch the Network tab while you convert (no requests leave the page), or disconnect from the internet after the page loads and keep working.

Is there a size limit or a fee?

The browser tool is free with no signup and comfortably handles files up to tens of megabytes (limited by your device's memory). For automated or bulk processing inside your own scripts and pipelines, use the paid REST API.

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