Jack, which launched in early 2002, will increase its cover size to give it more standout at retail outlets. Pagination will increase to a minimum of 308 pages and the cover price will be upped by 50p to £3.
Dennis does not publish an ABC figure for Jack but industry estimates suggest that it sells between 20,000 and 30,000 copies.
Jack also has a stronger editorial team. The new editor, Michael Hodges, has hired Steve Read as the creative director. James Brown remains onboard as a consultant editorial director.
Jack's publisher, Bruce Sandell, said: "Jack's future is very exciting - finally the magazine has the opportunity to fulfil its potential."