Available in English, French and Flemish, provides sample itineraries and detailed information on attractions and venues.
It is also a dedicated travel portal allowing travellers to book their accommodation as well as their Eurostar tickets in one place.
Nick Mercer, commercial director at Eurostar, said: "Over the years we have built an in-depth knowledge of the destinations we serve and we wanted to create a tool which would give us the opportunity to share this with our travellers."
Trip Planner will be promoted via emails to Eurostar's customer database.