What Is a Custom Domain for Short Links and How Do You Set One Up?

Updated

A custom domain for short links is your own domain name used as the base of a short URL instead of a shared provider domain like s.gy. On Short.io, you can create branded short links with your own domain or use the provider's domain, and the free plan includes custom domain support with up to 1,000 branded links and no credit card required. Setup means pointing your domain's DNS at the shortener and letting it issue SSL, so the links resolve over HTTPS under your brand.

Custom domain vs. shared shortener domain

The difference is only in the part before the slash:

Shared domain Custom domain
Example abc1234.s.gy/my-link yourbrand.co/summer
Brand visibility Provider's name Your name
Trust signal Neutral Matches your site
Control Provider-managed You own the domain and DNS

Short.io's page describes custom domains as a way to "create professional short links that build trust," with free automated SSL and unlimited domains per account. You can bring your own domain or buy one in-app.

Why branded short links matter

A link that carries your domain reads as yours, so recipients can verify it before clicking. That matters most where links are public or semi-public: campaign emails, social posts, printed QR codes, and partner materials. Short.io also positions custom domains alongside analytics and QR codes, so the same branded base can serve click tracking and scannable codes.

Setup steps

  1. Get a domain. Use one you already own, or purchase one through the provider's in-app option if you don't have a spare.
  2. Add the domain to your account. Short.io allows unlimited domains per account, so you can separate brands, regions, or clients.
  3. Connect DNS. Point the domain's DNS records at the shortener as instructed in your account. This is the step that actually routes yourbrand.co/summer to the link service.
  4. Enable SSL. Short.io provides free automated SSL; confirm the certificate is issued and the domain loads over https:// before you publish links.
  5. Create a test link and verify. Shorten one URL on the new domain, open it in a private browser window, and check that it redirects to the destination and that the padlock shows a valid certificate.

Common pitfalls

  • DNS not propagated yet. New records can take time to resolve; test again after waiting rather than re-adding records repeatedly.
  • SSL not yet issued. Links may work over HTTP but warn in browsers until the certificate is active. Don't print QR codes pointing at the domain until HTTPS is confirmed.
  • Wrong domain selected at link creation. With multiple domains, it's easy to shorten a link on the default domain by mistake. Check the domain field each time, especially for client work.
  • Mixing brands on one domain. If you run several brands, use separate domains rather than paths, so each link's origin is unambiguous.

When a custom domain is the right choice

Use one if links appear in customer-facing or printed material, if you need consistent brand recognition across campaigns, or if you manage links for multiple clients and want clean separation. If you're only shortening links for internal notes or quick one-off sharing, the shared domain is simpler and avoids DNS work entirely.