We do not collect any personally identifying information from users of shorta.link. We store only the information necessary to provide our URL shortening service (such as original long URLs) and information necessary to identify and track abuse of our service (such as IP addresses).\ All this information is stored by Cloudfare and only accessible by the shorta.link admins. We do not store any information about the user's browser or operating system, there is only aggregated information of countries and IP addreses to track abuse of our service, the minimum neccessary.
URLs shortened by shorta.link are not private and should not be treated as such. Third parties could easily guess the short URL that you are using, so you should not use shorta.link to link to sensitive or secure data.