With the advent of next-generation sequencing (NGS) systems and the associated high throughput they afford, the input to these machines requires manageable lengths of fragments (similar to 1000 bp) produced from chromosomal DNAs. Therefore, it is critical to develop devices that can shear DNA in a controlled fashion. We report a polymer-based microfluidic device that establishes an efficient and inexpensive platform with performance comparable to a commercially available bench-top system.