sitemap.xml Validator

Search engines reject a sitemap.xml that doesn't match the sitemaps.org spec — even one invalid date or an exceeded limit can stop the whole file from being processed. This tool checks required fields, date formats, size limits, and duplicate URLs.

How to use it

• Paste the contents of sitemap.xml and required tags (<loc>, valid <lastmod>) are checked instantly.
• Duplicate URLs are detected automatically and flagged separately from other errors.
• The tool checks the file against the sitemaps.org limits: no more than 50,000 URLs and 50MB per file.

Common uses

• Checking a sitemap before submitting it to Google Search Console or Bing Webmaster Tools.
• Debugging why Google Search Console reports errors while processing a sitemap.
• Auditing a sitemap generated automatically by a CMS or plugin for duplicates and malformed dates.

Things to keep in mind

The date in <lastmod> must follow the W3C Datetime format (ISO 8601) — search engines simply ignore an arbitrary text date format.

URL order in a sitemap has no meaning under the spec — search engines process entries regardless of their sequence in the file.