The Custom Domain settings within our Files.com site are integral to making your Custom Domain work the way you expect.

Provide the full domain name of your CNAME record (such as files.example.com) in your site's Custom domain setting. This domain is the only address that will be used for any new links generated by your site, such as Inboxes, Share Links, and links sent in welcome or password recovery emails.

Indicate whether you will use the Files.com-provided SSL certificate, or if you are managing your own. By default, the SSL certificate your Custom Domain will be managed by Files.com, and we recommend this for the vast majority of our customers.

You can choose whether to enable HTTP Strict Transport Security (HSTS) on your domain. Use of HSTS is a recommended best practice.

Custom domain and SSL certificate changes typically take effect within minutes, though in rare cases these may take up to 48 hours. While the changes are propagating, your users can continue to access your site at your custom subdomain without interruption.

HTTP Strict Transport Security (HSTS) on Custom Domains

HTTP Strict Transport Security (HSTS) is a policy mechanism that allows web servers to declare that web browsers should automatically interact with it using only HTTPS connections. Use of HSTS is a recommended best practice. Nearly every web browser supports HSTS.

We enable HSTS on all Custom Subdomains by default, and we optionally allow our customers to enable HSTS on Custom Domains as well.