The PSD file type is the default file extension of the proprietary file format of Adobe System's Photoshop program.
.psd (Photoshop document), the default file extension of the proprietary file format of Adobe System's Photoshop program. A .psd file stores an image with support for most imaging options available in Photoshop. These include layers with masks, color spaces, ICC profiles, CMYK Mode (used for commercial printing), transparency, text, alpha channels and spot colors, clipping paths, and duotone settings.
