Question 1

What is an XML sitemap and why validate it?

Accepted Answer

An XML sitemap is a file that lists all important URLs on your website in a structured format that search engines can easily read. It helps search engines discover, crawl, and index your pages more efficiently. Validating your sitemap ensures it follows the sitemap protocol standards and will be properly processed by search engines like Google and Bing. Invalid sitemaps may be rejected or cause indexing issues. Our validator checks XML syntax, required elements, URL formats, date formats, and other sitemap protocol requirements to ensure your sitemap will work correctly.

Question 2

What is the difference between a URL sitemap and a sitemap index?

Accepted Answer

A URL sitemap (with root element) directly lists individual URLs from your website. A sitemap index (with root element) is a sitemap of sitemaps - it lists multiple sitemap files rather than individual URLs. Sitemap indexes are useful when you have more than 50,000 URLs (the per-file limit) or want to organize sitemaps by section, language, or content type. Each sitemap in the index can contain up to 50,000 URLs. Our validator supports both types and will automatically detect which type you're validating.

Question 3

What date format should I use for lastmod tags?

Accepted Answer

The lastmod tag should use ISO 8601 date format. The simplest format is YYYY-MM-DD (like 2024-01-15). You can also include time with YYYY-MM-DDThh:mm:ss+00:00 (like 2024-01-15T14:30:00+00:00). The date should represent when the page was last modified. While lastmod is optional, it helps search engines prioritize crawling recently updated content. Our validator checks that dates follow ISO 8601 format and will warn you if the format is incorrect. Proper date formatting ensures search engines correctly interpret when your pages were last updated.

Question 4

What are valid values for changefreq and priority?

Accepted Answer

Changefreq indicates how frequently a page changes and accepts these values: always (changes every time it's accessed), hourly, daily, weekly, monthly, yearly, or never. This is a hint to search engines, not a command. Priority must be a number between 0.0 and 1.0, indicating the relative importance of URLs on your site (1.0 being most important). The default is 0.5. Note that priority is relative to other pages on your site, not across different websites. Our validator checks these values and warns you if they're outside the allowed range or use invalid options.

Question 5

Why is my sitemap showing namespace warnings?

Accepted Answer

The standard XML sitemap namespace is 'http://www.sitemaps.org/schemas/sitemap/0.9'. If your sitemap uses a different namespace or no namespace, our validator shows a warning. While search engines may still process sitemaps with non-standard namespaces, using the correct namespace ensures maximum compatibility and follows the official sitemap protocol. To fix this, ensure your or tag includes: xmlns="http://www.sitemaps.org/schemas/sitemap/0.9". This tells XML parsers how to interpret the sitemap elements correctly.

Question 6

What's the maximum size for a sitemap file?

Accepted Answer

Each sitemap file can contain a maximum of 50,000 URLs and must be no larger than 50MB uncompressed. If your site has more URLs, you should create multiple sitemap files and use a sitemap index to reference them all. Our validator checks the URL count and will show an error if you exceed 50,000 URLs. It cannot check file size since validation happens in the browser, but large sitemaps may cause browser performance issues. For large sites, split your sitemap into multiple files organized by section, content type, or language, and reference them in a sitemap index.

Question 7

Why must URLs in sitemaps be absolute?

Accepted Answer

All URLs in XML sitemaps must be absolute URLs, meaning they must include the full protocol (http:// or https://) and domain name. Relative URLs (like /page.html) are not allowed. This is because sitemaps are submitted separately from your website and search engines need to know the complete URL to fetch the page. Our validator checks that each <loc> element contains a properly formatted absolute URL with http or https protocol. For example, use 'https://www.example.com/page.html' instead of just '/page.html'. This ensures search engines can correctly crawl the URLs listed in your sitemap.

Question 8

Should I fix warnings or only errors?

Accepted Answer

Errors must be fixed for your sitemap to be valid and properly processed by search engines. Warnings indicate potential issues or deviations from best practices but won't necessarily prevent your sitemap from working. For example, an invalid URL format is an error that must be fixed, while a non-standard namespace is a warning that should ideally be corrected. Fixing warnings improves sitemap quality and ensures maximum compatibility with all search engines. Start by fixing all errors, then address warnings for optimal results. Our validator clearly distinguishes between errors (critical issues) and warnings (recommended improvements) to help you prioritize fixes.

XML Sitemap Validator

How to Use the XML Sitemap Validator

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Free XML Sitemap Validator & Checker

XML Sitemap Validator Features

Why Validate Your XML Sitemap

Common Validation Scenarios

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