An XML sitemap is a file in the sitemaps.org 0.9 protocol that lists the URLs you want crawled, each one a <url> entry holding a <loc> plus optional <lastmod>, <changefreq> and <priority> hints. Paste your page URLs and build a valid sitemap.xml with lastmod, changefreq and priority — the XML updates live as you type, with copy and download. Everything runs in your browser.
Paste your page URLs into the box, one per line — this tool cannot crawl your site, so you supply the list yourself. Pick a changefreq and priority to hint how often pages change and how they rank against each other, set a lastmod date, and the XML builds as you type. Bare domains are given https:// automatically, duplicate lines are dropped, and special characters are escaped so the output stays valid. Copy the block or download sitemap.xml.
Upload sitemap.xml to your site root, then submit its URL in Google Search Console under Sitemaps, and reference it from your robots file with a Sitemap: line. Need that file too? Use the robots.txt generator. Before you submit, run the file through the XML sitemap validator, and confirm the URLs are crawlable with the robots.txt tester.