Sitemap XML Validator - Validate Sitemap Syntax & Protocol Online
Validate sitemap.xml files against official XML schemas and sitemaps.org protocols to detect formatting bugs and broken tags.
This tool runs in your browser.
Processed locally in your browser.
How to use
- 01Enter or upload the source data.
- 02Run the tool in your browser.
- 03Review, copy, or download the result.
FAQ
What are the most frequent causes of sitemap errors?
Common flaws include unescaped ampersands (& instead of &), missing sitemaps.org namespace tags, and malformed ISO 8601 date strings.
What format must the lastmod tag follow?
It must strictly adhere to W3C Datetime formats (ISO 8601), formatted as YYYY-MM-DD or complete timestamps with timezone offsets.
Is my site sitemap uploaded or scraped during validation?
No. Validation operates via your browser’s local XML DOM parser client-side, ensuring complete confidentiality for unreleased URLs.