Why would you need to validate a sitemap?
A sitemap with a structural error or a broken URL can quietly stop search engines from processing it correctly, without giving you any obvious warning. Validating the file confirms it's correctly formatted and every URL inside it is actually reachable, before you rely on it to help with indexing.
The most common sitemap errors
Common issues include invalid XML syntax, URLs that don't match the site's actual domain, broken or redirecting links included instead of final destination URLs, and exceeding the maximum of 50,000 URLs per file. Any one of these can cause a search engine to reject the file entirely or process it incorrectly, so catching them early saves you from silently broken indexing.
Steps to validate a sitemap on Fastols
The tool checks your sitemap instantly:
Open the Sitemap Validator tool
Open the tool directly from the tools page.
Enter your sitemap's URL or upload the file
Provide the link to your live sitemap or the file itself.
Run the check
The tool scans the structure and every URL inside it.
Review the results
See any structural errors or broken links found.
Practical tips before you start
Before validating your sitemap, keep these points in mind:
- Make sure every URL in the file uses your site's actual domain, not a staging or test domain.
- Include only final destination URLs, not links that redirect elsewhere.
- If your file exceeds 50,000 URLs, split it into multiple sitemap files as recommended by search engines.
- Recheck your sitemap after any major site restructuring or domain change.
A sitemap with a structural error can cause a search engine to reject the entire file, so it's worth validating after every update.
Common use cases
- Checking a newly generated sitemap before submitting it to Google Search Console.
- Diagnosing why Google reported errors while processing your sitemap.
- Verifying a sitemap's URLs still work correctly after a site migration.
- Reviewing a large sitemap index file that contains multiple sub-sitemaps.
Why choose Fastols?
Full structural and link check
Catches both XML errors and broken URLs
No data stored
Your file is processed in your browser, not stored with us
Completely free
Unlimited use with no hidden fees
Supports sitemap index files
Checks files that reference multiple sub-sitemaps
Frequently Asked Questions
Does the tool fix errors automatically?
No, the tool identifies and highlights errors, and fixing them is done manually or by regenerating the file.
Is my data stored on your servers?
No, the file is processed in your browser and not stored with us.
Can I check a file from a direct URL?
Yes, you can enter the URL of the sitemap already uploaded on your site.
What's the maximum number of URLs allowed in one file?
The common standard is 50,000 URLs per sitemap file; if you exceed that, you'll need to split the file.
Does the check confirm every URL actually works?
Yes, the tool verifies the status of every URL listed inside the file.
Can I check a sitemap index file that references sub-sitemaps?
Yes, the tool supports checking both regular sitemap files and index files that reference multiple sub-sitemaps.
Ready to check your sitemap?
Try the sitemap validator for free right now — no sign-up, no software to install.
Try the Sitemap Validator Now