On the routes between Germany - Sweden, Poland - Sweden, Latvia - Sweden and Germany - Latvia, the ID documents listed below are approved for check-in.
This applies to all passengers, including children.
On the routes between Denmark - Sweden and Denmark - Norway, the identification documents listed below are approved for check-in and travel for citizens within the EU/EEA. For travelers from outside the EU/EEA, passport is the only valid document. This also applies to children.
This applies to all passengers except children under 16 years traveling on their parents' IDs.
The above rules are Stena Line's general rules for traveling with their ferries to and from Sweden. It is the traveler's responsibility to check the type of documentation required before entering the country they are travelling to.