Sitemap validator
Catch broken or stale sitemaps before search engines do.
How it measures
- The file (gzip supported) is inspected up to 2 MiB without an XML parser, so DTDs and entities are never processed.
- Up to five same-host URLs are checked with HEAD requests.
- Protocol limits: 50,000 URLs and 50 MB uncompressed per sitemap.
Limits
- Counts are lower bounds when the file is truncated at 2 MiB.
- Child sitemaps in an index are listed, not recursively validated.
Troubleshooting
- Identical lastmod everywhere
- Regenerated timestamps that do not reflect real changes are ignored by search engines. Use the actual modification date.