Valid XML structure
The checker rejects DTD/entity declarations and parses at most 1 MiB. Large valid sitemaps return a bounded partial result instead of consuming unbounded memory.
Website + SEO
Validate a sitemap without downloading it without limits.
Enter a hostname or a direct sitemap XML URL. The checker validates bounded XML, counts captured locations and checks whether URLs are absolute and consistent.
Result
Diagnostic result
Absolute locations
Search engines expect fully qualified URLs in sitemap <loc> entries. Relative locations are called out.
Cross-host entries
URLs on another host are surfaced for review. Cross-site sitemap setups can be valid when ownership is intentionally configured.
Search-engine limits
A single sitemap may contain up to 50,000 URLs and 50 MB uncompressed; this public checker deliberately inspects a much smaller bounded sample.