Validators
sitemap.xml Validator
Validates sitemap.xml against the sitemaps.org schema: namespace check, urlset/url/loc presence, lastmod date format, changefreq enum, priority range, total URL count vs the 50,000 limit, and total uncompressed byte size.
Input
Invalid
Format
unknown
URLs
0
Errors
1
Warnings
0
Issues
- errorXML parse failure: DOMParser is not defined
What this checks
- XML is well-formed.
- Namespace is sitemaps.org/schemas/sitemap/0.9.
- Root is <urlset> or <sitemapindex>.
- Each <url> has a valid <loc> (HTTP/HTTPS, parseable URL, under 2048 chars, not duplicated).
- <lastmod> uses W3C datetime / ISO 8601.
- <changefreq> is in the allowed set.
- <priority> is between 0.0 and 1.0.
- Total URL count is within 50,000.
- Total uncompressed size is within 50 MB.
Real usage example
Scenario
A migration generated a new sitemap and the team wants to catch malformed lastmod values.
Input
Paste the generated sitemap.xml output from staging.
Output
Namespace, URL count, size, date, changefreq, and priority validation results.
Verify on a real URL
Run a full agent readiness scan to see how your live site responds end to end.