Image and video sitemap extensions

What it is

Sitemaps support extensions for declaring images and videos associated with each page. They use additional XML namespaces alongside the standard urlset.

<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
        xmlns:image="http://www.google.com/schemas/sitemap-image/1.1">
  <url>
    <loc>https://example.com/articles/csp</loc>
    <image:image>
      <image:loc>https://cdn.example.com/csp-hero.jpg</image:loc>
    </image:image>
    <image:image>
      <image:loc>https://cdn.example.com/csp-diagram.png</image:loc>
    </image:image>
  </url>
</urlset>

The video extension is similar (xmlns:video) and supports more metadata: title, description, thumbnail_loc, content_loc, and player_loc.

Why it matters

Crawlers normally find images by parsing the HTML of pages they fetch. That is usually enough. The extensions only earn their keep when:

• Media is loaded by JavaScript and not in the initial HTML.
• Media lives on a different host (a CDN or media subdomain) that crawlers do not visit independently.
• You publish a lot of original photography or video and want crawlers to discover updates quickly.

For most marketing sites, plain <img> and <video> elements with good alt text and <source> declarations are enough. The extensions are an optimisation, not a baseline.

How to implement

For images:

• Up to 1,000 images per <url> entry.
• Each <image:image> needs only <image:loc>. Other fields (caption, title, geo_location, license) are accepted by some crawlers but are not widely used.
• Use the canonical image URL — the one the page actually loads. CDN URLs are fine.

For videos:

• Each <video:video> needs thumbnail_loc, title, description, and one of content_loc or player_loc.
• Keep titles under 100 characters and descriptions under 2,048.
• Add duration in seconds where possible.

For both, prefer to add them to existing page sitemaps rather than create a separate image or video sitemap. That keeps the relationship between page and media explicit. If volume is too high, split into a dedicated sitemap-images.xml and reference it from your sitemap index.

Common mistakes

• Listing images that are not actually used on the page in <loc>. Crawlers cross-check.
• Pointing <image:loc> at a redirect or a 404.
• Forgetting the xmlns:image or xmlns:video namespace declaration on <urlset>.
• Treating these as a ranking lever. They help discovery, not ranking.

Verification

• Validate the sitemap against the extension XSDs.
• In Search Console, check the Sitemaps report for parsed image and video counts.
• Test that each <image:loc> returns 200 OK with an image Content-Type.