The URL Preview Service scans websites’ HTML to give Snapchatters a preview of the websites shared by their friends in chat. A preview is a card with a title, subtitle, and thumbnail that links to the website. For example:

The URL Preview Service prioritizes Open Graph tags (og:title and og:image), but will use Twitter Card tags (twitter:title and twitter:img:src) to gather information for the preview.

The URL Preview Service makes HTTP requests with the user agent "Snap URL Preview Service; bot; snapchat; https://developers.snap.com/robots", and it will cache responses to URLs for 30 minutes to avoid excess traffic to a single URL.