Sitemap Validator - Check XML Sitemap Errors Free
Validate your XML sitemap for errors and warnings. Check URL format, date values, priority ranges, and XML structure. Ensure search engines can read your sitemap correctly. 100% client side - no data leaves your browser.
Input Sitemap
Paste XML, upload a .xml file, or fetch from a URL.
About Sitemap Validation
An XML sitemap is a file that lists all the important pages on your website, helping search engines like Google, Bing, and others discover and crawl your content more efficiently. A well-formed sitemap follows the Sitemaps Protocol, which defines the required XML structure, valid elements, and acceptable values for each field. If your sitemap contains errors, search engines may ignore some or all of your URLs, which can hurt your organic visibility.
Why Validate Your Sitemap?
Search engines silently reject malformed sitemaps. You might never know your sitemap has issues unless you check manually or use a validator. Common problems include broken XML syntax (unclosed tags, invalid characters), missing <loc> elements, incorrect date formats in <lastmod>, out-of-range <priority> values, and invalid <changefreq> entries. Even a single XML parsing error can prevent the entire sitemap from being processed.
Common Sitemap Errors
Missing xmlns declaration: The <urlset> element must include xmlns="http://www.sitemaps.org/schemas/sitemap/0.9". Without it, parsers may not recognize the document as a valid sitemap.
Invalid lastmod dates: The <lastmod> value must follow the W3C Datetime / ISO 8601 format. Acceptable formats include YYYY-MM-DD, YYYY-MM-DDThh:mm:ssTZD, and YYYY-MM-DDThh:mm:ss.sTZD. Dates like "January 15, 2026" or "01/15/2026" are not valid.
Priority outside range: The <priority> value must be a decimal between 0.0 and 1.0 inclusive. Values like "2.0" or "-0.5" will be flagged as errors.
Invalid changefreq: Accepted values are limited to: always, hourly, daily, weekly, monthly, yearly, and never. Any other string is invalid.
Sitemap Best Practices
Keep your sitemap under 50,000 URLs and 50MB uncompressed, as specified by the protocol. If your site is larger, use a <sitemapindex> to split URLs across multiple sitemap files. Always use absolute URLs in <loc> elements (including the protocol). Update <lastmod> only when page content actually changes, not on every sitemap regeneration. Submit your sitemap to Google Search Console and Bing Webmaster Tools for faster indexing, and reference it in your robots.txt file.
Sitemap Index Files
Large websites often use a sitemap index file that references multiple individual sitemaps. This validator supports both standard <urlset> sitemaps and <sitemapindex> files. For index files, the tool checks that each <sitemap> entry contains a valid <loc> element pointing to an individual sitemap file.
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Usman has 10+ years of experience securing enterprise infrastructure, managing high-traffic servers, and building zero-knowledge security tools. Read more about the author.