Should I validate a sitemap before resubmitting it to search engines?
Yes. Catch malformed XML, duplicate loc values, non-HTTPS links, and invalid lastmod fields before you push another crawl cycle.
Sitemap Validator
Validate sitemap.xml and sitemap index files
Automation & DevOps
π 100% client-side β your data never leaves this pagePage mode
Input
Quick CTA
Paste sitemap.xml content and inspect errors and warnings first; duplicate-URL and strict lastmod checks stay in Deep.
Output
Validation result appears here
π 100% client-side
Next step workflow
Page reading mode
Quick keeps the summary, direct answers, and next steps so you can validate fit and get a result faster.
About this tool
Sitemap Validator helps verify sitemap.xml and sitemap index files before deployment. It checks XML structure validity, entry extraction, URL format correctness, HTTPS usage, duplicate loc values, and lastmod date parsing. This is useful for technical SEO QA, release pipelines, and post-build sanity checks to prevent indexing issues caused by malformed sitemap data. The tool provides entry-level status and warning summaries so fixes are straightforward. Validation happens entirely in your browser, making it safe for pre-production URLs and internal staging artifacts.
Direct Answers
Does every sitemap entry need lastmod?
No. Only include lastmod when you can produce trustworthy timestamps; noisy or fake dates reduce the signal quality.