k-o.pro

Sitemap Generator & Validator

Validate any XML sitemap against Google's spec or generate a clean one in seconds.

What the validator checks

The tool fetches your sitemap and runs the following checks:

  • Valid XML structure — malformed XML fails silently in most CMS outputs
  • Correct sitemap namespace declaration (xmlns="http://www.sitemaps.org/schemas/sitemap/0.9")
  • Root element type — urlset for standard sitemaps, sitemapindex for index files
  • URL count vs the 50,000-URL limit
  • lastmod coverage — how many URLs have a last-modified date
  • Sub-sitemap detection for index files

Google's hard limits

Each sitemap file: 50MB uncompressed or 50,000 URLs — whichever comes first. If you exceed either limit, the file is ignored. Split into a sitemap index and submit each child sitemap individually.

Common sitemap problems

Missing lastmod values: Googlebot can't prioritize recently updated pages without them. Non-canonical URLs in your sitemap: including /page?utm_source=email contradicts your canonical signals. Sitemaps that haven't been regenerated since the last migration: these are the most common, most invisible issue.

When to validate

After any site migration. When Googlebot's crawl rate drops without explanation. When GSC shows a sitemap fetch error. When you've added more than 1,000 URLs in a batch and want to confirm the sitemap updated.

Frequently asked questions

Is this sitemap tool free?

Yes, free and no signup. It validates an existing sitemap or generates a new one.

How many URLs can one sitemap hold?

Up to 50,000 URLs or 50MB uncompressed, whichever comes first. Split larger sites into multiple sitemaps with a sitemap index.

Does a sitemap guarantee indexing?

No. It aids discovery. Indexing still depends on content quality and crawl signals.

Related tools: Google index checker and robots.txt validator and generator. Background reading: check URL status codes in Google Sheets.