XML sitemap validator
Is your sitemap
valid XML?
Paste a sitemap or a sitemap index and see what breaks the sitemap rules, with a line number for every finding.
What the documents say
"each Sitemap file that you provide must have no more than 50,000 URLs and must be no larger than 50MB (52,428,800 bytes)."
"all URLs in a Sitemap must be from a single host, such as www.example.com or store.example.com."
"This URL must begin with the protocol (such as http) and end with a trailing slash, if your web server requires it. This value must be less than 2,048 characters."
"This date should be in W3C Datetime format."
"Use fully-qualified, absolute URLs in your sitemaps."
Free, no account, nothing leaves your browser.
How to use it
- 1Paste your sitemap XML
Open yoursite.com/sitemap.xml, view the source, copy it all and paste it in. A sitemap index works too. Optionally add the address the file lives at, to check where its URLs are allowed to be.
- 2Read the errors and warnings
Errors are departures from the sitemap rules, such as malformed XML, a relative URL, a bad lastmod or a mix of hosts. Warnings are worth a second look. Each shows its line number.
- 3Fix the file and paste it again
The tool reads only what you paste. It does not request your URLs, so it cannot say whether they return 200 or whether Google indexes them. Use Search Console for that.
Questions
What does it check?
That the XML is well-formed (matched tags, escaped ampersands, one root); that the root is a urlset or a sitemapindex with the sitemaps.org namespace; that each entry has a loc that is an absolute http or https URL under 2,048 characters; that lastmod values are in W3C Datetime format; that changefreq and priority values are valid; that the file is within 50,000 URLs and 50MB; that no URL is listed twice; and that all URLs share one protocol and host.
Where do the limits come from?
The sitemaps.org protocol and Google's sitemap documentation both say a sitemap holds at most 50,000 URLs and is at most 50MB (52,428,800 bytes) uncompressed. A sitemap index may list at most 50,000 sitemaps. The size is measured here on the text you paste, as UTF-8. A gzipped sitemap is checked uncompressed, because the limit applies to the uncompressed file.
Is this the same as Google's validation?
No. It is a reimplementation of the rules the two documents state, written by us, not Google's parser. It does not check the XML Schema file, fetch your URLs, or test how Google treats them. A clean result is not a promise that URLs will be crawled or indexed. Google says it ignores the priority and changefreq values, and uses lastmod only if it is consistently and verifiably accurate.
Why does it flag a mix of protocol or host?
sitemaps.org says all URLs listed in a sitemap must use the same protocol and reside on the same host as the sitemap, and that URLs which are not valid are dropped. So http and https, or www and non-www, in one file is reported as an error. Add the address of the sitemap in the optional box and it also checks the folder rule: a sitemap at /catalog/sitemap.xml can list only URLs that start with /catalog/.
What counts as a valid lastmod?
The W3C Datetime profile: a year, a year and month, a date (YYYY-MM-DD), or a date and time with a timezone, such as 2026-10-07T12:30:00+00:00 or 2026-10-07T12:30:00Z. A time without a timezone is flagged. The date should be when the page was last modified, not when the sitemap was generated; this tool cannot know that, but it warns about dates in the future.
Is my sitemap uploaded?
No. Everything runs as JavaScript in your browser and nothing is sent to a server. Very large pastes may be slow, and the page stops listing findings after the first 200.
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