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Tools / XML sitemap validator

XML sitemap validator

Download and validate XML sitemaps against standard sitemap protocols. Inspects URL counts, HTTPS encryption compliance, and missing lastmod timestamps.

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About this tool

An XML sitemap lists the URLs you want search engines to find. This validator downloads a sitemap and checks it against the sitemap protocol: it counts the URLs, verifies they use HTTPS, and flags issues such as missing lastmod timestamps or entries that do not respond.

A broken or malformed sitemap quietly undermines indexing — search engines may skip it entirely, or waste effort on dead URLs. Checking the URL count and spotting broken links or missing metadata helps ensure the sitemap is actually helping rather than hindering discovery.

Use it after generating or updating a sitemap, when diagnosing indexing problems, or to audit a site you are taking over. It reflects the live sitemap as fetched, so it shows what search engines would see.

Frequently asked questions

What does the sitemap validator check?
It validates the sitemap against the protocol, counts the listed URLs, checks for HTTPS, and flags problems like missing lastmod timestamps or broken links.
Why does a valid sitemap matter for SEO?
It helps search engines discover your pages efficiently. A malformed sitemap can be ignored, and dead URLs in it waste crawl budget.
What is the lastmod timestamp?
It tells crawlers when a URL last changed, helping them prioritise recrawling. Missing lastmod values are flagged as they reduce the sitemap’s usefulness.
When should I validate my sitemap?
After generating or updating it, and when troubleshooting why pages are not being indexed.

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