First CH Apps / sitemap.xml Validator
Enter a sitemap URL and we fetch it, check that it parses as XML, and show how many URLs it holds, how their lastmod dates are spread, and what a sitemap index points at (one level deep). Give us just a site URL and we find the sitemap from the Sitemap line in robots.txt.
Point straight at https://example.com/sitemap.xml, or give just https://example.com and we look at robots.txt first, then fall back to /sitemap.xml. Gzipped sitemaps (.xml.gz) work too.
Valid XML does not help if the URLs inside return 404. Paste them into the bulk HTTP status checker to see which ones still resolve.
Go to the Bulk HTTP Status Check →A `Sitemap:` line in robots.txt tells every crawler where your sitemap lives. The robots.txt generator on tools.first-ch.com builds the file from a form — entirely in your browser, nothing uploaded.
Go to the robots.txt Generator (tools.first-ch.com) →Sent: only the URL you type. Our server (Cloudflare Workers) fetches that sitemap as a public page — plus /robots.txt when discovery is needed, and the child sitemaps of an index. A single check makes at most 40 outbound requests.
Stored: nothing. The check lives entirely inside one request and writes neither the URL nor the result to any database (no KV, no D1). It leaves memory when the request ends.
Returned: analysis only — counts, the lastmod spread, warnings with line numbers, and the first 200 extracted <loc> values. We never re-serve the fetched XML. We read at most 1MB per file and parse at most 600,000 characters per check, to stay inside the free-tier CPU limit.
Note: public GET only. URLs pointing at internal networks, localhost or private IPs are rejected, and sitemaps behind a login cannot be checked.
POST /sitemap-check/api/check with JSON ({"url": "https://example.com/sitemap.xml"}) or a form body and you get the same result back as JSON.
sitemaps.org caps one file at 50,000 URLs and 50MB uncompressed. Beyond that, split the file behind a sitemap index — indexes may not be nested.
Google uses neither changefreq nor priority. It uses lastmod as a crawl-priority signal only when the value is maintained accurately, so stamping every URL with the generation time is counter-productive.
Being in a sitemap does not guarantee indexing, and being absent does not keep a URL out of the results. A sitemap helps discovery; it does not decide inclusion.