The splicer, for splicing a first web material and a second web material, comprises a retaining device adapted to hold a leading edge of the second web material in a standby position; and a dispenser for an adhesive, comprising a dispensing member configured to dispense a strip of adhesive onto the leading edge of the second web material in the standby position. An unwinder and a line are also disclosed, using splicers as defined above, as well as a method for splicing two web materials together.