How Short URLs Work: The Technology Behind Link Shortening

URL shortening is essentially a mapping between a compact code and a longer destination. The service stores that relationship and uses it when the short address is requested.

1. A destination is submitted

The creator provides the complete destination URL. The service validates the address and prepares it for storage.

2. A short code is created

A unique code is generated or selected as a custom alias. That code becomes part of the short URL.

3. The mapping is stored

The service stores the code together with the destination and any supported options required for the link to work.

4. A visitor opens the short URL

The server receives the code, looks up its destination and returns a redirect response or preview page.

5. The browser follows the redirect

The browser then requests the original destination. From the visitor's perspective, the process is usually very quick.

Redirects and reliability

A short link depends on the shortening service remaining available and keeping the mapping intact. Website owners should test important links and use a service with clear policies.

Security basics

Short URLs can obscure the final destination, so users should be cautious with unexpected links. Website owners should not create links to deceptive or harmful destinations.