A shredder includes a paper placement platform, a feeding roller assembly, and a shredding knife assembly. The paper placement platform includes four recesses. The four recesses are located adjacent to four corners of the paper placement platform, respectively. Moreover, plural clip removing bulges are discretely protruded from and arranged on a top surface of the paper placement platform beside each recess. The feeding roller assembly is arranged between the paper placement platform and the shredding knife assembly and exposed to the paper placement platform. During the paper on the paper placement platform is driven by the feeding roller assembly to be moved toward the shredding knife assembly, an edge of the paper is transferred through the plural clip removing bulges, so that a paperclip at the edge of the paper is blocked by the plural clip removing bulges to be separated from the paper.