MOBI (Mobipocket) ndi mtundu wa e-book wopangidwira Mobipocket Reader. Mafayilo a MOBI amatha kukhala ndi zinthu monga ma bookmark, mawu ofotokozera, ndi zinthu zomwe zimatha kubweza, kuzipangitsa kuti zizigwirizana ndi zida zosiyanasiyana zama e-reader.