In the present invention a web processing apparatus is provided comprising a web transport station and a web processing station. Said web transport station is arranged to transport, in a single mode of the web processing apparatus, a first web in a process direction towards or away from the web processing station, and to transport, in a tandem mode of the web processing apparatus, the first web and a second web in the process direction towards or away from the web processing station. The web transport station comprises a web tension control assembly, which comprises a first tensioning device and a second tensioning device. Said first tensioning device is movably arranged for controlling tension of a first web. Said second tensioning device is movably arranged for controlling tension of a second web independently of the tension of the first web. Said first tensioning device comprises a first interior space and the first tensioning device is arranged with respect to the second tensioning device such that the first interior space at least partly accommodates the second tensioning device.