sitemap.xml Check

Why sitemap.xml is the unsung hero of indexing

A sitemap is the discovery channel of last resort. Google finds 90 % of pages via internal links. The remaining 10 % — new pages, orphan pages, deep pages — are discovered through sitemap.xml. Miss that file and these pages may never be indexed.

The three sitemap structures you encounter

• Single sitemap — one XML file, up to 50,000 URLs or 50 MB.
• Sitemap index — a wrapper file listing multiple sub-sitemaps. Standard for WordPress (Yoast, Rank Math) and large sites.
• Sitemap by type — separate sitemaps for pages, posts, products, categories. Helps debug per-type indexing issues in GSC.

The lastmod question

Google's John Mueller has stated repeatedly: lastmod is a strong signal — but only if it's accurate. CMS systems that set lastmod to "now" on every export break this signal. The correct lastmod is the date the page content actually changed, not the date the sitemap was regenerated.

What this tool catches

• XML syntax errors — malformed XML drops the entire sitemap from Google's queue.
• URL count — over 50,000 needs a sitemap index.
• Lastmod coverage — what fraction of URLs has a valid lastmod date.
• Sitemap-index resolution — clicks through to the listed sub-sitemaps.

The GEO angle

Generative engines crawl sitemaps to build their topic graph. A clean sitemap accelerates the rate at which a new article enters Perplexity's and Google AI Overviews' candidate pool. A broken sitemap delays new content by days. Submit your sitemap in Google Search Console and Bing Webmaster Tools — both feed AI indexes downstream.