This website presents a fast GPU algorithm to perform the discrete wavelet transform featuring flexible boundary extension schemes, flexible wavelet kernels, Cg shader implementation, and high precision. The algorithm was developed by the Graphics Team at The Chinese University of Hong Kong. The beauty of the method is that both forward and inverse wavelet transforms are unified using position-dependent filtering and convolution and an indirect addressing technique. The software is open source and free for any commercial or academic use, and is currently available both as an unofficial GPU extension to the Jasper JPEG2000 software and as a standalone DWTGPU C++ class with a demo program. (Jianqing Wang, Tien-Tsin Wong, Pheng-Ann Heng and Chi-Sing Leung. The Discrete Wavelet Transform on a GPU.)