What makes a sitemap invalid?

A sitemap becomes invalid due to XML syntax errors, missing required elements like tags, invalid URL formats, incorrect namespace declarations, or exceeding size/URL limits. Common issues include malformed XML, broken URLs, invalid date formats in lastmod elements, priority values outside the 0.0-1.0 range, and unsupported changefreq values. The Sitemap Checker identifies all these issues with specific error messages and locations.

How often should I validate my sitemap?

Validate your sitemap whenever you make changes to your website structure, add or remove pages, update URL patterns, or notice indexing issues in search engine tools. For dynamic websites with frequent updates, monthly validation is recommended. For static sites, validate quarterly or after major changes. Regular validation ensures your sitemap remains compliant and search engines can properly crawl your content.

What's the difference between errors and warnings?

Errors are critical issues that prevent search engines from processing your sitemap correctly, such as invalid XML syntax or missing required elements. Warnings are non-critical issues that don't prevent processing but may affect optimization, like invalid date formats or priority values outside recommended ranges. Focus on fixing errors first, then address warnings to improve sitemap quality and search engine crawling efficiency.

Can the tool validate sitemap index files?

Yes, the Sitemap Checker validates both standard sitemaps and sitemap index files. For sitemap indexes, it validates the entries, ensures proper elements for child sitemaps, and checks lastmod dates. It also validates that referenced sitemap URLs are properly formatted and accessible. This makes it suitable for large websites with multiple sitemap files.

What are the sitemap size and URL limits?

According to sitemaps.org protocol, sitemap files must be under 50MB in uncompressed size and contain no more than 50,000 URLs. If you exceed these limits, you should split your sitemap into multiple files and create a sitemap index file to reference them. The Sitemap Checker automatically checks these limits and warns when they're exceeded, helping you maintain compliant sitemap structures.

How do I fix common sitemap validation errors?

Common fixes include: ensuring proper XML declaration and encoding, validating all URLs are accessible and properly formatted, checking that all elements contain valid URLs, using correct date formats (YYYY-MM-DD or ISO 8601), setting priority values between 0.0 and 1.0, using valid changefreq values (always, hourly, daily, weekly, monthly, yearly, never), and including the correct sitemap namespace declaration. The tool provides specific guidance for each identified issue.

Sitemap Checker

Validate XML sitemap syntax, check for broken tags, invalid URLs, and character encoding issues. Ensure your sitemap meets search engine requirements for optimal indexing with comprehensive error detection and validation reports.

xml

sitemap

validator

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Quick Presets

Preset sitemap inputs for quick validation and error spotting

Input & Settings

Enter a sitemap URL or paste XML sitemap content to validate it.

Sitemap URL or XML Content

How it works: The checker validates XML structure, sitemap namespace, URL formatting, and common metadata issues like invalid `lastmod`, `changefreq`, and `priority` values. It surfaces structured findings instead of forcing a raw XML diff.

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