📋 XML Validator
SEO.io
Paste your XML to validate syntax and find errors instantly.
Try a sample:
1
What is Well-Formed XML?
Well-formed XML must follow these rules: it must have a single root element, all tags must be properly closed and nested, attribute values must be quoted, and special characters must be escaped (& < >). This validator checks all these rules using the browser's built-in XML parser.
Common XML Errors
- Mismatched tags — <tag> closed with </tg>
- Unclosed tags — Missing closing tag or self-closing slash
- Unescaped ampersand — Use & instead of &
- No root element — XML must have exactly one root
- Duplicate attributes — Each attribute name must be unique per element
FAQ
Can I check competitor pages?
Yes, analyze any publicly accessible URL to understand what top pages do right.
Is this as good as paid tools?
Covers the essentials for quick checks. Paid tools add historical tracking and bulk analysis.
How do I fix the issues found?
Each issue has a specific recommendation. Follow them in priority order.
Does it affect my site?
No. The tool only reads your page — it makes no changes to your site.
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