Sitemap Checker: Validate and Fix Your XML Sitemap

A sitemap checker does what Google does when it processes your sitemap — but before you submit it, when you can still fix problems. Running a check before submission prevents Search Console errors, wasted crawl budget on broken URLs, and silent indexing failures that only surface weeks later.

What a Sitemap Checker Does

A sitemap checker analyzes your XML sitemap for errors, missing pages, broken URLs, and SEO issues. It validates the XML format, checks that listed URLs are accessible, and identifies problems that prevent Google from properly using your sitemap.

How to Check Your Sitemap for Errors

Enter your sitemap URL into a sitemap checker tool. A good checker verifies XML validity, checks HTTP status codes for all listed URLs, flags redirects and canonical mismatches, identifies pages missing lastmod tags, and detects URLs blocked by robots.txt.

Common Issues Sitemap Checkers Find

The most common sitemap errors are: invalid XML syntax, URLs returning 404 or 301 redirects, pages blocked by robots.txt, duplicate URLs, missing or incorrect lastmod dates, and URLs that do not match the canonical tag on the page.

Checking Your Sitemap in Google Search Console

Google Search Console has a built-in sitemap checker. Submit your sitemap URL and Google will tell you how many URLs were submitted, how many were indexed, and any errors it encountered.

Validating XML Structure Manually

Before submitting to Google, validate your sitemap XML using an XML validator. Your sitemap must have a valid urlset namespace, each URL wrapped in url tags, and all special characters properly encoded.

How Often to Check Your Sitemap

Check your sitemap monthly, or any time you make significant changes to your site structure. Also check after a CMS upgrade, after installing new plugins, and after migrating to a new domain or URL structure.

Diagnosing a Sitemap That Returns Errors

When a sitemap checker reports errors, work through them in severity order. A sitemap that returns a non-200 HTTP status (404, 500, 403) means Google can't read the file at all — fix the server issue before addressing individual URL problems. An HTML response where XML is expected means your sitemap URL is wrong or your CMS is returning an error page. Once the file itself is accessible, address URL-level errors: remove 404s immediately, update 301 redirects to point to final destination URLs, and remove noindex pages from the sitemap.

Checking Each URL's Status Code

The most actionable output of a sitemap check is the per-URL status code report. Every URL in a healthy sitemap should return HTTP 200. 301 redirects in a sitemap waste a crawl hop — Google has to follow the redirect before it can read the page. 404 errors in a sitemap create Search Console warnings and signal to Google that your sitemap is poorly maintained, reducing trust in your other submitted URLs. A sitemap checker that follows redirects and reports the final status code for each URL lets you see exactly which entries need to be updated.

Verifying Canonical Alignment

A URL in your sitemap and the canonical tag on that page should match exactly — including protocol (https vs http), trailing slash, and subdomain (www vs non-www). Mismatches tell Google your sitemap was built from a different URL set than your actual canonical structure, creating the "Submitted URL not selected as canonical" error in Search Console. SitemapFixer checks canonical alignment for every URL in your sitemap, flagging any page where the canonical tag doesn't point back to the same URL submitted in the sitemap.

What a Passing Sitemap Check Should Show

A fully passing sitemap check means: the sitemap file returns HTTP 200 with valid XML, the sitemap namespace is correct, every URL returns HTTP 200, no URLs are blocked by robots.txt, no URLs have noindex tags, every URL's canonical tag matches the submitted URL, and lastmod dates are in valid ISO 8601 format. When all of these pass, you can submit with confidence that Google will be able to read and use your sitemap effectively. Any single failure — especially canonical mismatches or robots.txt conflicts — can cause silent indexing failures that take weeks to diagnose through Search Console alone.

Sitemap Check After a Site Migration

Running a sitemap check immediately after a domain migration or URL restructure is critical. New sitemaps generated post-migration often contain old URL patterns, incorrect protocol references (http when the site moved to https), or URLs that now return 301 redirects to their new locations. These errors compound during migration: Search Console flags them, Google deprioritizes the new sitemap, and indexing of your new URLs slows significantly. A sitemap checker that validates every URL with live HTTP requests catches these migration artifacts before they cost you indexing time.

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