We fabricate different-sized Al/AlOx/Al Josephson junctions by using a simple bridge-free technique,in which only single-layer E-beam resist polymethyl methacrylate (PMMA) is exposed at low accelerate voltage (below 30 kV) and the size of junction can be varied in a large range.Compared with the bridge technique,this fabrication process is very robust because it can avoid collapsing the bridge during fabrication.This makes the bridge-free technique more popular to meet different requirements for Josephson junction devices especially for superconducting quantum bits.