The company is expecting the online booking service to take one-in-three appointments during 2008.
Motorists booking a combined MoT and service online will qualify for a further £5 discount off list prices, which already start from £99. Customers can still book by phone or by arranging an appointment at their local centre.
David White, customer services director at Kwik-Fit, said: “We know from previous research that busy motorists want us to make it as easy as possible for them to be able to book their car in for a service or MoT.
“The online booking facility is the latest in a long line of website innovations at Kwik-Fit, and motorists can expect us to see more fantastic developments shortly.”