The .psd file extension is given to files that have been created by the Adobe Photoshop computer application. The Adobe Photoshop application is a professional image-editing program that can create a variety of image elements such as layers and masks. When these files are created, they are saved with the .psd file extension.
Adobe Photoshop is one of the most commonly-used image editing applications on the market and it is very popular among desktop publishers and image editors. The images created in Adobe Photoshop tend to take up less space than other image file formats. PSD files can be read by both Windows and Macintosh computers with the appropriate software installed.
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If you have additional information about the PSD file format or software that uses files with the PSD suffix, please do get in touch - we would love hearing from you.