TexturePacker is an application to create your sprite sheet. Just drag your sprites, choose exporter and image format, and press publish. It helps you to reduce memory usage and improve game performance. TexturePacker can export to a big bunch of gaming frameworks out of box. Features include quality color reduction, smart folders, trimming or cropping save space by removing transparency, can import SWF, PSD, PNG, TGA, JPG, TIFF, and BMP formats, export format supports PNG, PVR, PVR.CCZ, PVR.GZ, JPG, JPEG, and KTX, integrate it into your build process, and layout algorithms.