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## Subdomains rollout

Effective September 2025.

New projects use only personal subdomains on \*.ucarecd.net.
Existing projects continue to use ucarecdn.com, with subdomains available in the Delivery tab of project settings.
We have started implementing unique CDN subdomains for each project, replacing the generic `https://ucarecdn.com/` domain.
The default CNAME has been updated to use a subdomain in the format `https://:subdomain.ucarecd.net/`, where each project is assigned a unique subdomain (replacing the `:subdomain`).

**Potential breaking change**

If your application has hardcoded logic or Content Security Policy (CSP) settings tied to `ucarecdn.com`, you may experience issues with file uploads or thumbnail rendering.

We recommend locking that in the File Uploader configuration:

```
<uc-config
  cdn-cname="https://:subdomain.ucarecd.net/"
  ...
</uc-config>
```

An example for jQuery Uploader configuration:

```
<input type="hidden" role="uploadcare-uploader"
  data-public-key="YOUR_PUBLIC_KEY"
  data-cdn-base="https://:subdomain.ucarecd.net/"
/>
```

Introducing subdomains will enable enhanced access control, facilitate signed URLs without requiring a custom CNAME, enforce usage restrictions, and help prevent abuse.
Existing customers will keep access to the legacy CDN domain type `https://ucarecdn.com/`, together with new ones.
New customers will only have access to new subdomain names.