Sitemap XML validator & formatter

What this sitemap validator checks

• Well-formed XML — a single stray character breaks the whole file, and search engines silently skip a sitemap they can't parse.
• Absolute, valid URLs — every <loc> must be a full http(s):// URL. Relative paths and leading/trailing whitespace are silently dropped.
• Valid lastmod dates — must be W3C datetime (YYYY-MM-DD or full ISO 8601). Google ignores a malformed one — and treats a future date as suspicious.
• priority and changefreq — priority must be between 0.0 and 1.0; changefreq must be one of the seven allowed values. (Google ignores both, but other crawlers still read them.)
• Duplicates & size limits — duplicate <loc> entries waste crawl budget, and a single sitemap may hold at most 50,000 URLs and 50 MB uncompressed.
• Sitemap index files — if the root is <sitemapindex>, each child <sitemap> is checked for a valid <loc> too.

Your sitemap never leaves the browser. To have it cross-checked against the pages that actually exist on your site — and be alerted when they drift apart — try siteOS.