Discussion about implementing a cname asset domain in Sanity.io

Custom asset domains (CNAME for cdn.sanity.io) are available, but they're an Enterprise plan feature. This isn't currently available on the Growth or other lower-tier plans.

From the community discussion, Sanity confirmed that custom domain names (CNAME) for the Asset CDN are available on enterprise plans. So if you need assets.example.com instead of cdn.sanity.io, you'll need to reach out to Sanity's sales team about an Enterprise plan.

Workaround Options

If you're not on an Enterprise plan, there are a couple of practical workarounds:

1. Reverse Proxy/Redirect Approach (recommended for most cases)

You can set up a simple redirect on your hosting platform. For example, on Netlify:

• Extract the filename from Sanity's asset URL: const fileName = url.substring(url.lastIndexOf('/') + 1)
• Use your custom domain in links: https://your-domain.com/files/${fileName}
• Set up a redirect rule: /files/* → https://cdn.sanity.io/files/[your-project-id]/[your-dataset-name]/:splat

This approach works well for PDFs and other file assets. For images, you can use the baseUrl option in @sanity/image-url to point to your custom domain.

2. Use Another CDN

You could proxy assets through another CDN service (like Cloudflare, Fastly, etc.) that sits in front of Sanity's Asset CDN, giving you a custom domain while still leveraging Sanity's Asset CDN infrastructure.

SEO Considerations

While having a custom domain can be nice for branding, it's worth noting that using cdn.sanity.io shouldn't negatively impact SEO in most cases. Search engines care more about factors like:

• Image alt text and context
• Page load speed (Sanity's CDN is built on Google's global infrastructure)
• Proper image optimization
• Overall site authority

The Asset CDN already provides excellent performance with global edge caching, automatic compression (Brotli and Gzip), and content-addressable URLs that enable aggressive browser caching.

If custom asset domains are important for your use case, I'd recommend reaching out to Sanity's sales team to discuss Enterprise plan options.