.PSD Estensione file

Adobe Photoshop Document

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Che cos'è un file PSD?

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.

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Screenshot di un file .psd in Adobe Photoshop 2025 — File PSD aperto 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)

NOTA: 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.

Come aprire un file PSD

You can open PSD files with Adobe Photoshop in Windows and macOS. To open a PSD file in Photoshop, select File → Open.

While PSD files are saved in a proprietary format, you can also open them with other multi-platform applications, such as Adobe Illustrator, Corel Painter, GIMP, and Photopea (in a web browser).

In Windows, you can open PSD files with the built-in Microsoft Photos app. In macOS, you can view them with Apple Preview, which is bundled with the operating system.