What is a PSD file? A PSD file is the native image format used by Adobe Photoshop, a professional image-editing program used for enhancing digital photos and creating web graphics. PSD files may include image layers, adjustment layers, annotations, file information, keywords, and other Photoshop-specific elements. They are commonly created and shared among graphics professionals.

More Information PSD file open in Adobe Photoshop 2025 The PSD format is a fully editable, uncompressed format, ideal for editing raster images. You can modify individual elements within a PSD file, such as images, shapes, text, and effects. New versions of Photoshop (2024 and later) allow you to create and insert AI-generated graphics. PSD files support RGB , CMYK , grayscale, monochrome, duotone, indexed color, Lab color, and multichannel color modes. You can change the color mode by selecting the Image → Mode in Photoshop. The data structure of a PSD file The Photoshop file format is comprised of five sections: File Header - Stores image properties like dimensions, bit depth, color mode, and channel count Color Mode Data – Includes additional data if the file uses indexed or duotone colors Image Resources – Contains non-image elements such as guides, text styles, or paths Layer and Mask Information – Stores data about layers, masks, blending modes, and effects Image Data – Contains the actual image data (pixel data) and the compression method used to reduce the overall file size (e.g., raw, RLE, ZIP) NOTE: Photoshop supports PSD files up to 30,000 x 30,000 pixels or 2 GB in size. Images larger than these limits must be saved in the .PSB (Photoshop Big) Large Document format.