When an image sitemap helps
Google finds most images through <img> tags. An image sitemap helps when images are lazy-loaded by script, served from another domain, or important for Google Images traffic — product photos, recipes, galleries, portfolios. Each <url> lists up to 1,000 <image:image> children with an <image:loc>.
Images on a CDN are fine; the image host does not need to match the page host, but the CDN must allow Googlebot to crawl. Since 2022 Google ignores image:caption, image:title, image:geo_location and image:license, so this generator emits image:loc only.
Collect images automatically
On the creator, start a crawl with “Collect images” switched on: every page’s <img src> URLs are gathered and written into the same sitemap — one file for pages and images.
Questions
Do I need a separate image sitemap?
No. Image entries can live inside your normal sitemap, or in a separate file listed in your sitemap index. Both work.
Can image URLs be on a different domain?
Yes. Images on a CDN or another host can be listed; that host must not block Googlebot in its robots.txt.
Are image titles and captions supported?
Google deprecated them in 2022 and ignores them. Use alt text and surrounding text on the page instead.
What is the limit?
Up to 1,000 images per page URL, and the usual 50,000 URLs / 50 MB per sitemap file.